Malicious PDF — malware analysis report

Static analysis result for SHA-256 80116d6b6073bb16…

MALICIOUS

PDF

71.0 KB Created: 2021-03-14 09:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d662a7cc570121a0f30b3dad5f76e020 SHA-1: b429b581e6ac7062055196873083dd925d583c25 SHA-256: 80116d6b6073bb167ee3b6116a928af97652f0d64e56a2d0633047af3640c5f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on link farms, suggesting a phishing or SEO poisoning campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the structure and link farm behavior are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=design+sprint+kit+pdf
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/vubitujezepiserudi.pdf
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/e66be93.pdf
    • http://onsideball.info/latin_american_countries_and_capitals_worksheet7q4qg.pdf
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/bijobuti.pdf
    • https://tulebowad.weebly.com/uploads/1/3/4/4/134467329/8da2de6f.pdf
    • http://tudewulowas.iblogger.org/jurakejulufalal.pdf
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/suzasetapebulijogis.pdf
    • http://betmoy56.com/backtracking_in_data_structurexx8v9.pdf
    • http://wigigokewadusad.iblogger.org/2000_7.3_powerstroke_engine_diagram.pdf
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/mikewitusada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rijaliwiguvex/noun_phrase_worksheets_grade_7.pdf
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_dd61ebf8ba114a3d98b6ec7af388f6cd.pdf?index=true
    • https://s3.amazonaws.com/norozovijalu/jurassic_park_full_movie_tamil.pdf
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_bf53e3dcbf9749dfaaefa7417db7ee1e.pdf?index=true
    • http://rezopaduj.epizy.com/difference_between_budgeting_and_forecasting.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/15512453586.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_a0427dbbd8fe4aeb857439f29f816988.pdf?index=true
    • https://s3.amazonaws.com/goviwigax/zogawivi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b7.bin
62656ce30b9994b3936dfb9fe893fd6cabdd617bffda76a7844be54b820cd0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 5028 bytes
font_01_sfnt_off0000e9f3.bin
85bcaa91cb0be2ac39d6b19b19dd15e651bdef3f218efb50ab8ca383e6f9d62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 11272 bytes

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