Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bbcd9b19da9e2…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 19:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 616202b76d2c8125a3bc79bbf6a6dec1 SHA-1: 5743961c2a6a77d3fdcdc9b835be3f93ca40ed9f SHA-256: 773bbcd9b19da9e2efd4ac421b0afc84eba2893a217de2289388968fe95d76e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=biophysical+techniques+by+upadhyay+pdf PDF link annotation
    • https://tasototunone.weebly.com/uploads/1/3/4/7/134755659/5036669.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/3541194.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/midogijajinusujesuvifibox.pdfIn PDF document text
    • http://masewir.22web.org/case_580_super_e_backhoe_operators_manual.pdfIn PDF document text
    • https://subinekole.weebly.com/uploads/1/3/2/6/132695692/6498496.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/2014_chevy_malibu_led_lights.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/9645599.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/budajok-zaxilibotogejen-woxepamosis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisipusizen.rf.gd/biological_classification_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235b00be-3237-4b79-8092-c22a290a04ac/free_recording_mixing_and_mastering_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3718d89-b208-43ca-959e-3dd8c7d68340/harry_potter_hardcover_box_set_collectors_edition.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/82382716138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84a0cd5-2439-41f3-b47a-3a0385ef3d6f/pikuwenosef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33619f2c-f0f9-41ce-8b03-672ac8351675/5231971609.pdfIn PDF document text
    • http://desavoz.epizy.com/57182623703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd372d5-3473-4c21-a7ec-b2209cd46920/o_que__trfego_organico_marketing_digital.pdfIn PDF document text
    • http://daremafuxabo.rf.gd/public_administration_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ed68b3-62dc-4ba7-a377-7730041c9d4c/josenano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc543d8d-3ccb-4223-ae09-cfc491b71d25/probabilidad_y_estadistica_para_ingenieria_y_ciencias_devore_8_edicion.pdfIn PDF document text
    • http://foxivowopejo.rf.gd/beep_song_in_tamilanda.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 5564 bytes
SHA-256: b4c230f7744deffd7531569d3b578e1e9bcf22c2032caf83408adf34ed3503a6
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 11396 bytes
SHA-256: 34ea137428b31282f5ea068189a8103bf65621f472b4b3c2aff7f1f0026a10a3

Open this report in the interactive analyzer, or submit your own file for analysis.