Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0a89033c7e5380…

MALICIOUS

PDF

76.0 KB Created: 2021-03-26 07:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7daae6c7fa5883856a690f7f2e505124 SHA-1: ce182bdbcf80837760201c863e91d10b04cd2285 SHA-256: 8b0a89033c7e5380f9e98435e9c9c83090d46e43d7d10e906ce5c9cdb6ee3f62
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=convert+pdf+files+to+autocad+free+download PDF link annotation
    • http://kigurumi.org/34189503144z308c.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/mazidonof_sabene_vikaz.pdfIn PDF document text
    • http://mujogatebili.22web.org/administracin_de_pequeas_empresas_enfoque_emprendedor.pdfIn PDF document text
    • http://rezotu.xyz/synonym_of_safe_haventxgw9.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/34415567450tz1p8.pdfIn PDF document text
    • http://erogancolumbia.site/26466296095s5c0s.pdfIn PDF document text
    • http://pollsexpert.com/music_sean_paul_trumpets9wff4.pdfIn PDF document text
    • http://fbcopyright-center.com/skinny_body_care_lawsuit455bs.pdfIn PDF document text
    • http://fresh-ita.fun/sportspower_grand_peak_wooden_swing_set_walmart5yh5n.pdfIn PDF document text
    • https://sanorasawuvut.weebly.com/uploads/1/3/0/7/130738762/9659544.pdfIn PDF document text
    • https://jevakotimafunu.weebly.com/uploads/1/3/4/8/134878594/kediwiwid_bupuvuziraxepu.pdfIn PDF document text
    • https://dufanidozit.weebly.com/uploads/1/3/4/7/134764520/1567060.pdfIn PDF document text
    • http://idealica-columbia.site/gogelg77b5.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/tuligakavekitota.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/889ed5.pdfIn PDF document text
    • http://csxmoney.info/lexekidu0s13b.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/wigulun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubojudojo.epizy.com/vuralesejabopusapadu.pdfIn 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_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 5204 bytes
SHA-256: 6733382fa31bcebc525264d39f2f69d2a2c7e46f04a7aa79b63bb6524b5c6501
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 11156 bytes
SHA-256: f93b7f20ddf3c8585b2ae486169d1b5c56f9cd98817e1e2a839d0243246eef45

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