Malicious PDF — malware analysis report

Static analysis result for SHA-256 125c1c367273ca99…

MALICIOUS

PDF

69.9 KB Created: 2021-02-15 02:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c813a1d5d176e85cf44a6c3c7cabcab4 SHA-1: 9514ab3f1d3eaca90469ea02ec8c7fb3f8cd8921 SHA-256: 125c1c367273ca996bc0cdc36ae3e4a049462b7524d029d864f3215192c9f272
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=dey+appliance+parts+eagan+mn PDF link annotation
    • http://xigotazuwal.iblogger.org/unicorn_birthday_party_invitation_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fd660a97c259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5ff51bbf9a667.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/gifejawotilinos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_602978ebe3f50.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/cyiepih/recarga_a_cuba_fonoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc9855de5be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_601f19c5a6981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450248/normal_5feb96e572604.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/niv2Ric/81951627172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6027b0b9388ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/jdgcfib/5410899464.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/Nnifyjd/talorujelekala.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/9geDgfu/french_manicure_short_nails_natural.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/Amih0ih/88974542082.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/c5df6f8105a334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fc9f8bfdd6d1.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/8982377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fc770a1b7326.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/TApgh2K/pebudonugarisifedeb.pdfIn PDF document text
    • http://www.deydistributing.comIn PDF document text
    • http://www.deyparts.netIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusunumef.rf.gd/92776577955.pdfIn PDF document text
    • http://keruxenuriwi.epizy.com/counting_to_120_worksheets_for_first_grade.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 5352 bytes
SHA-256: 269f52f9167a3095ca80cc2988025430a5ffdb9324334624a073ea52bbb2a574
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10504 bytes
SHA-256: 9ca853344b766decd35df84060134cf76d2c7d40d321339a8754929b42442cb5