Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e6e4c022f23676…

MALICIOUS

PDF

63.0 KB Created: 2021-01-16 23:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 721810edc226e8fb6d1eb5efb8d1c83a SHA-1: bc39ad5cd418294948d8e1b2414cd322e87428a7 SHA-256: 43e6e4c022f2367678aa905ec84a11e4e4221ee616900d6a537f47d8bb870f71
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=substitution+method+worksheet PDF link annotation
    • https://site-1167963.mozfiles.com/files/1167963/kindergarten_learning_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369502/normal_5fc750b8d1d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5f9978a5ed611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fdfba12718f1.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/5031649.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/cb8494.pdfIn PDF document text
    • https://vujofuda.weebly.com/uploads/1/3/4/3/134375628/dekasakep-gufinufobi-zazaxuwo.pdfIn PDF document text
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/xikeroj-bepaxepedi-wojegudodalu.pdfIn PDF document text
    • https://gokewulifas.weebly.com/uploads/1/3/4/5/134599519/pupoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/60615619062.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/good_subject_line_for_informational_interview_request.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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 5224 bytes
SHA-256: 5a4b1f3d034f8dbc3cbd67b674df8ab3cb20c7204b782e7491424c0f46d2178c
font_01_sfnt_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 10848 bytes
SHA-256: 99246bb749aa1f9b67e45848308f998141a8be0bd4a563b56de1a5f5d5dbe8b0

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