Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f29b23ffaaec61f…

MALICIOUS

PDF

124.9 KB Created: 2021-02-22 07:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 265876602e73a9f85816e4e3419c08c2 SHA-1: abb8729ba1745cf4db47a921b8fecbeec5c6a728 SHA-256: 5f29b23ffaaec61f7148234a15d60c5aa2bb68daca0cca95c4a3d7c15a8e2f0e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for a link farm. It contains numerous external URLs pointing to various domains, many of which appear to be disposable hosting. The document body is heavily obfuscated, but the presence of external links suggests a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=how+to+program+motorola+apx+4000 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fed332e3a66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_602075396e91d.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/6252998.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/Ygeji6i/85225735298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fdeea1b88f9e.pdfIn PDF document text
    • http://datingdate.site/18467316305l4p64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6016d3643af19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fdaefa810a46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504641/normal_5fcaad098df0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_602c551610c9f.pdfIn PDF document text
    • http://bossyonlinex.com/demonstrative_pronouns_for_grade_1uob09.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/7hfhbgj/67060385590.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/2164275.pdfIn PDF document text
    • http://smcjd.com/introduction_to_structural_dynamics_and_aeroelasticity_solution_manual3t79h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5ffa2b1433f8e.pdfIn PDF document text
    • http://shtangye.xyz/29546174227y1dxa.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/14343791ce.pdfIn PDF document text
    • http://muldwych.com/xixedxkuff.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/posipowi-rodulisudozi-fefewuzaximipuk-zezolikotigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001a921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A921 5312 bytes
SHA-256: a54175ce5b5d8510ab48a820af064d251535f11499b8d0667b87385612c08995
font_01_sfnt_off0001bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB39 13244 bytes
SHA-256: 46fcaf7cce2b67e95a52885e143ca1d194a40edd8e8d546f3153088fbd784e0a

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