Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9add853427135f…

MALICIOUS

PDF

73.1 KB Created: 2021-02-22 22:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 05907a3f40cb986ed80a83586eeffcd4 SHA-1: 22537ed2dee25f92bff4fe60fb9e049241253224 SHA-256: fa9add853427135fefa75d894eaff93ca01212cf839edfebe298b91cd4049275
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wb?keyword=javascript%20absolute%20path%20asp.net PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370767/normal_603358f425516.pdfIn PDF document text
    • http://dvigatel.guru/cercles_de_la_forme_beaubourg_telephoneq9pq9.pdfIn PDF document text
    • http://republvinb.fun/planck_s_law_of_blackbody_radiationtrbw2.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/3cf49a6.pdfIn PDF document text
    • http://egrn-order.online/175182884894pw5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496389/normal_5fefd8691ac36.pdfIn PDF document text
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/paraduviva_lerekobizuden_tutiwadoros_fevasadezola.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/9452258.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/tobepuk0dpx.pdfIn PDF document text
    • http://reduslim-buy.site/eutanasia_pasiva_y_activawagxy.pdfIn PDF document text
    • http://ig-support-service.com/61414513813e4jwq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6024ed5bc0ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_60293b653c97d.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5244 bytes
SHA-256: 9878902dd34be4931223e9b02904af83758577bf3893515219fd7b8a5d6ae292
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 11816 bytes
SHA-256: 385fcdb593f757af7856843cbb2770e5b7416c00b9f069a9420cd3122d44b53d

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