Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4922f39576ead3b…

MALICIOUS

PDF

83.5 KB Created: 2020-11-18 16:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad8186b358204912d8e74d9e7bdf05ff SHA-1: 6cb669a032a475bc1f238643cbbbcf2f7170141c SHA-256: f4922f39576ead3bb7217cc15d3f962cbb43f81764633f0348a27e2e509a4feb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious sites.

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-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://trafffe.ru/123?utm_term=hormone+matching+worksheet
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/fdba9d64.pdf
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/1d195fc8e0c3127.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/b94e1a.pdf
    • https://tovisasuwuvep.weebly.com/uploads/1/3/4/5/134513775/c8d84810.pdf
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/6be3dd2476f1f7d.pdf
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f94b14eef81e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf67f207-0a20-4c5c-b562-90494be7faed/larog.pdf
    • https://s3.amazonaws.com/paropabaru/pink_floyd_brain_damage_tab.pdf
    • https://uploads.strikinglycdn.com/files/e82794ef-0900-4126-8a40-4557a2d5a0b2/jejozofiwuwedaluk.pdf
    • https://uploads.strikinglycdn.com/files/2846dbf4-d48c-48a5-ab99-91bac795a762/wopirilobamapafusow.pdf
    • https://s3.amazonaws.com/tetenifeme/sutupezu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a5.bin
1881944fe0d156c3adaaa50906d05391b9ce8457c282ec4b7a6b3d91742a32bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 5296 bytes
font_01_sfnt_off00011b8d.bin
92d6638a74400a5b9d2aeafcde0385325e50f75cd558773009210ec5a3e8a5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 11176 bytes

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