Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be3f0b093695300…

MALICIOUS

PDF

67.3 KB Created: 2020-11-25 10:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7dfa620b0a48a7edbe543e4b404847b4 SHA-1: d2233132fdc83547e8514d73637dfe82bcb330d9 SHA-256: 0be3f0b093695300b68496a95903ff8a3e9a2bd86d9446483384b252f87c1dd8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=miss+susie+had+a+steamboat PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://pixogapowirotuj.weebly.com/uploads/1/3/4/6/134641161/7907547.pdfIn PDF document text
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/pategelo_sawejopa.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/6158153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5fbae9734d708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5fba26d75b263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f87023e3fb35.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/vabikadapetota_dajeseni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1211dfa1-394c-4bcb-bfe0-88944fdc3d4d/koniwelovojavawazaxolis.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/papolazuxaxujidagawojuxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98906548-8098-4eb1-908a-0fe2e0458232/pebuwufaviba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8b9dcf-d68d-4587-98b8-bfa46f36ecdf/vuwumuxexuz.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 5084 bytes
SHA-256: 891c300591aca1c596aeaf56b7a5f2c7f5a16515203ff3d55063fc6f35c734fc
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 11260 bytes
SHA-256: 8e5c116d5d694063a024f2f80615fe33542f9b45b9fda7915510fb0212c16f39

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