Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9accf3f502f0a…

MALICIOUS

PDF

82.2 KB Created: 2021-04-02 17:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 576633be3c2c099ada3c3e276add80a5 SHA-1: 73e6befff00b3ee20fbcdd5343d5bd3f548e6e6b SHA-256: fac9accf3f502f0a57c4bc1b14f57354b40b434ad11b9948c8990de54c1660e4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=asa+classification+american+society+anesthesiologists+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390097/normal_6005b73650aa0.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/myles_munroe_sermons_on_prayer_and_fasting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370533/normal_6003a189e3240.pdfIn PDF document text
    • https://cdn.sqhk.co/felegabiw/fgh8Mih/residence_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/4f4hild/maxupoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_6061089cbb302.pdfIn PDF document text
    • http://xademubizu.sportsontheweb.net/dizoviz.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/jabkEsu/teruvoviv.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/levedazadu.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/hMgcgdc/backpack_mod_for_minecraft_1._7._10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_d7fa0b06d30d4784b510cbca06fd7439.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_44db3f05154b4679bdd74d58517fc779.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/theories_of_geological_evolution_catastrophism_vs_uniformitarianism.pdfIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_c747ed59903f48fe804f18af8efcb65a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/tibuxom.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_38deec4561d14493abb653a96f16e3fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/buruxukuxusaziladefotedar.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_fc87563e6556485b856a716381c1c059.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/who_installs_pool_heaters_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/cochlear_implant_parts_australian_hearing.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_5541f0b8682c472d801171dd8baed5c1.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_f7125bb9b9344ae4916ef4676b1ce380.pdf?index=trueIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/28499521339.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_997d9f445def43e18cb31fc9ed584194.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_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 5660 bytes
SHA-256: 8b50a6def44b1a095f0027d316c4d3cfbdbdcdd84080bb9a740fdd590971ea4d
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 10656 bytes
SHA-256: 8b2c7195d79570e64ade51c623346bea73085bab78ba59b6d7ec07537239f5eb