Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fb3149ede71fbe…

MALICIOUS

PDF

86.1 KB Created: 2021-01-05 09:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7acf65b5aa13595bbb87fed27f988bfd SHA-1: d277ea85809dfe97f326241ad34cb36069be7b55 SHA-256: a2fb3149ede71fbeabb678a24547cf5b9aa0a0fbb53351a30c70a5bdf00c1431
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with a high ML classifier score and ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to direct users to potentially malicious or SEO-manipulated content. The document body is heavily obfuscated and contains metadata related to PDF generation, but no direct scripting was found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=holistic+select+dog+food+reviews
    • https://cdn.sqhk.co/kipasewimoni/gjbgjiv/57612538382.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/6059209.pdf
    • https://kamijiruwidezi.weebly.com/uploads/1/3/4/3/134387945/6528c6d45b0.pdf
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/f95a6042c77122.pdf
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/disixibuwipitam-butejopupodu.pdf
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/99f50305.pdf
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/zizuxivudogove_geduru_vugimarukefemot.pdf
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/61347.pdf
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/gojewaferek-kupexo-fomikemofewixu-gozenakexifab.pdf
    • https://cdn.sqhk.co/sixepatexup/fxgdhiy/bifakegalalowenasatuniza.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdf
    • https://litoxixolemor.weebly.com/uploads/1/3/4/3/134379235/bizetigijav.pdf
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/dafazufazisage_jofufeme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wazotojemov/zobolakex.pdf
    • https://s3.amazonaws.com/libeganot/nujeru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b8.bin
540310ade8ae56799fd32aa08159b4e1f25729bc0593f16fa156cf5b88131494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 4776 bytes
font_01_sfnt_off00011819.bin
9b8a92cb08dc1a116c431bee7f235c1315735736b8d888af212243cbdaea9772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10852 bytes
font_02_sfnt_off00013d06.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 4324 bytes

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