Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd1915f0109bd8…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 23:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e6a183fe0650988b47953a6886b06596 SHA-1: 9d18b26373e0e53310989e6a7ab744c20dd35cfa SHA-256: 3dcd1915f0109bd8414541b26644f61616fc201b8683668d88c63acceac0057e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, references a job transfer letter, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+write+a+letter+of+intent+for+job+transfer PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/jgjiFgd/79975013107.pdfIn PDF document text
    • http://usmileofficial.site/xariwodososanixuwubibn70k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fea186ea1150.pdfIn PDF document text
    • http://detonic-italia.website/26090807268aoka6.pdfIn PDF document text
    • https://cdn.sqhk.co/fopajuxalaso/h3Eghjf/winolokezev.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/4291630.pdfIn PDF document text
    • http://copyright-infringement.business/626868833068g8xz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_602c42e64841d.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/vovas.pdfIn PDF document text
    • http://formverifiedbadge.com/jubiwegidodaxudlxwh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_603539f543b98.pdfIn PDF document text
    • http://daravto18.ru/sasujalizo0plg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5fd060f5f2bfa.pdfIn PDF document text
    • https://nesotufofiwin.weebly.com/uploads/1/3/1/3/131381712/7243244.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/hieThgA/learning_upgrade_math_demo.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/5209382.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5032 bytes
SHA-256: 6c3d3e3421ebd78e0dd6cc0cc48e1f6f17441b7ece1981136a736d97c5a9c49a
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10720 bytes
SHA-256: da1c9b866b641192d50cacbf9df85bc629f89268b8e78f32fc90be2c9e98fd69

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