Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6bcb885edfe814…

MALICIOUS

PDF

127.4 KB Created: 2021-04-09 18:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c5720705704f6cd5605be5d3aaf3f39 SHA-1: 25a7c06d6486dcc3cb2a500c6851e1b0c3ed3007 SHA-256: 1f6bcb885edfe814a394b8ce377e6268c71920c4381bf34b2f391b6a39981152
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9633

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=what+does+flock+mean+in+spanish PDF link annotation
    • http://bumefivaloso.scienceontheweb.net/usb_connector_types_chart.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/nudirawoda.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/sisefewok.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/ca27e9d24e992.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/22102017405.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/278651.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/le_corbusier_5_points_de_larchitecture_moderne.pdfIn PDF document text
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/nivune_sewojisi_mutasoladutake_kojemorix.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gegfgiD/vaziviketakapirisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_606b8ecfb66e6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/8H8oChe/youku_video_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/wD0Mhav/archero_promo_codes_2020_august.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/arrhythmia_treatment.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/vupolumudiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_604e4af097524.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/33936999083.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/sociologia_da_educao_durkheim.pdfIn PDF document text
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/gewaw-wutaziwitud.pdfIn PDF document text
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/1725859.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/gurakafazogupa.pdfIn PDF document text
    • http://xeniveperovabef.sportsontheweb.net/voyelles_arthur_rimbaud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wovodijulenape.onlinewebshop.net/banimorosovopokegopupesel.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/history_of_axum_obelisk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off0001b6f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B6F4 20716 bytes
SHA-256: 234d1ddd771aa513ec85f079dbe0258f2baf5b04a040ce0dcd0089ddb8398eb8
font_00_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 7492 bytes
SHA-256: bfc6c7f2488ad6212cd513e7e27ea6d6bdd6a742db9350a7bb6b17c77a7189c3
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 5376 bytes
SHA-256: 55f4e6a654637215889200965b056288961f37c1e50af7b9c3c9e071d101108b
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off00013c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 4524 bytes
SHA-256: 5ec5eed44b6b2bea501d5b7a017690e96067ec79627e21eb6bb068c5dfdbf255
font_04_sfnt_off00014b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 2328 bytes
SHA-256: c42118b51b061dffbc196cd4866a2cf76d9f31ae9d0a8f6c06e6ad224a677b24
font_05_sfnt_off000155bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BD 3560 bytes
SHA-256: 420aaf9f83ff0718701b72b2152b86b6085fcca354a87e836c264e69e792efcd
font_06_sfnt_off0001637c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637C 7492 bytes
SHA-256: 5c5d940ed35fc1003f5e8ba375b88f9d3ed0cf88e6412dc6aff030eff288d15c
font_07_sfnt_off000177f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F6 22824 bytes
SHA-256: ab9a29abd30577325e3740af34faec04c53fe8415b355acb9bb5bdb327b08cd4
font_09_sfnt_off0001dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBE8 3940 bytes
SHA-256: f5247407fb380fe77ab8edde1684f312f6a9128ed9439324993b87ba7fd8725e

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