Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ca1f15b2f452ab…

MALICIOUS

PDF

70.1 KB Created: 2021-03-22 06:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f3fac820bd751f798490867b88e2fc2 SHA-1: 9f31bd50b23c5edcc6b6c08eb5d2ee320b2ec05a SHA-256: 82ca1f15b2f452ab2edca09443646d4407affc1dac25296fd9e0c4692b8d787c
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=aliment+definition+pdf PDF link annotation
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/fevezo_ketafesozikop.pdfIn PDF document text
    • http://xofiladaf.22web.org/walefokexubelugeke.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/dedasedadeluvupu.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/Wkheic0/41982231184.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/jdwJiaZ/space_combat_simulator.pdfIn PDF document text
    • http://biditudoti.22web.org/57144152609.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/hgEhgAW/97883085108.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/90480464610.pdfIn PDF document text
    • http://bizarur.iblogger.org/40503136204.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/jggcoia/94602208780.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/434107b2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafoboverel.epizy.com/dugikoxajifo.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_de1971b10ce84c3d8a5628ea68dfb279.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1f3c5f7a577049fa89d21ce0e2a18e71.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_6a000a044f0c47a8b91456b7b7e51e97.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_26260f8b85ab48908cca11dc8abaf890.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_6ba6e405c45a4ae6b6e966a6803fe6ba.pdf?index=trueIn PDF document text
    • http://tamikukezinubi.rf.gd/wusapiseme.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_d1e576efaa8f42db8e9a91bea9193294.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/what_education_do_you_need_to_be_in_the_military.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_25cb025fb8d443c0aa1b794dc167eca0.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_90473e5a0e074d939e843e618b7376f5.pdf?index=trueIn 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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 4692 bytes
SHA-256: 9c7b9bed2112885290ce8c5990a91adc86dbb8184e5f9f2d2a3878c240fb2983
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 11272 bytes
SHA-256: 9d570ed155cef7ce83e44f075955aa2bf0e38bc590a8042be447cb1e46bad5cf

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