Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b60eca3eaf68ae…

MALICIOUS

PDF

74.2 KB Created: 2021-03-24 06:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46ed18a50f8eba8568466936d41997a5 SHA-1: 5aecca9f79fe5bb154b3c77089bed3aabb793140 SHA-256: a5b60eca3eaf68aed2406e8a95b2301e31f96145dbae6ddfa48eb3d616eecd08
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 0.9992

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://zajinet.ru/strik?utm_term=full+meaning+of+tcp%252Fip+in+computer PDF link annotation
    • http://garderob-podolsk.ru/26677190113h45gj.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/dtDifjj/70296234640.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/SUifEia/pokemon_showdown_text_commands.pdfIn PDF document text
    • http://helper-badges.com/organizational_culture_types_handyq30x7.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/djezhj4/word_treasure_book_price_in_bangladesh.pdfIn PDF document text
    • http://vehicleinsusa.com/57845865326x2dn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fedba0dc9cc8.pdfIn PDF document text
    • http://bogplaktnc.fun/nejidofubimidahl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_605a622c795f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd6696b949c9.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/iagfuLf/8597149896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fc738508b370.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/eajbjfj/weather_forecast_portland_maine_usa.pdfIn PDF document text
    • http://pitushok.fun/rawuj7zc3q.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/Iie3htc/dare_you_to_love.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/P8sHGhj/48143639653.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/e3hghbe/sulovitajewusuvotafonud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fcea10c54a70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_2461e0923a86481cb52eb48d21f87454.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_f8a4b06302c24d51b359e91d76c65926.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_72f1ff550032423aa6b1168e01589b36.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_105522755aeb4220ba9e505184be9119.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_c91eb86f557746c598faad9fb854f2e9.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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5148 bytes
SHA-256: 0c163f3e3146e67f10d780b4e87c1ad746e85eccb321a237a59e8cd8d96cba7c
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10408 bytes
SHA-256: 58ab16185eefa5452be7f7825f6b076068a872160a38e3012b99c3bce533e49b