Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e64bac6cf1c4d1…

MALICIOUS

PDF

65.6 KB Created: 2021-01-04 20:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3dc89da3c7e0c65b158671b56e1febcd SHA-1: 2d242197e2b650d07602121acc041f2e787680a5 SHA-256: 03e64bac6cf1c4d158e8145b8c21efbdf4e1996079ebdbccb8d405bc799a1559
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to a 'chemical bonding quiz answer key', which serves as a lure to direct users to malicious sites like https://trafffe.ru/aws?utm_term=come+together+chemical+bonding+quiz+answer+key.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/aws?utm_term=come+together+chemical+bonding+quiz+answer+key PDF link annotation
    • https://jidevamomibowi.weebly.com/uploads/1/3/1/4/131437101/vapovuwo-tukafe.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/23d545d.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/bekixesi_pewaf_muxetidolevugeb_dikur.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/puruxuzalote_nadiruroxalekow.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/balubeviti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5fa0d5170408a.pdfIn PDF document text
    • https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/jokamulaxasip.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/b2cdfae.pdfIn PDF document text
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/9080769.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/jinabisura/american_dream_song.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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 5832 bytes
SHA-256: 5db7d1901e2128d4bdf0179de4edc94367d42d6c33c11170bc7d521bc2d792e5
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 10388 bytes
SHA-256: a712aaa7fad2e4a73afb26e9ddc8b199f0a3b645a32a558a9a88b6616c59c442

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