Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49b8faaeb335f86…

MALICIOUS

PDF

81.0 KB Created: 2020-12-28 08:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3dea32b852445c9b93699a8cff09a56 SHA-1: 3aa641e135ac6613920dc5e9084e0800a0ee4100 SHA-256: c49b8faaeb335f86db7f185d1feaf761f295706ac58a4c4d635fdc22414fdf9c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'wkhtmltopdf' in metadata and the PDF structure suggest it may be used to disguise malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=good+morning+images+hd PDF link annotation
    • https://buritovetozew.weebly.com/uploads/1/3/4/4/134486370/252da45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f8bd6f339fb1.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/lizixidorenotuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f993e729e828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5fc806b9c452c.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/jchaGjf/kobe_vs_lebron_james.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5fd823137a02b.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/5060371.pdfIn PDF document text
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/gedim.pdfIn PDF document text
    • https://tovalowu.weebly.com/uploads/1/3/4/3/134375552/3707038.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/Vwjbgi4/87716468871.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/tadovu/william_wordsworth_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/free_resume_templates_word_with_picture.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 5236 bytes
SHA-256: cf742a64587d8aa4ec68c765d0262c794b9e6fcd712ef3e6d88609ccab160318
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10972 bytes
SHA-256: 462a439650abe3bf17d2efa4f3774cefaeedf9263189e9443ba876028404c1bd

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