Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d3b88e5b9b80e4…

MALICIOUS

PDF

79.8 KB Created: 2021-01-23 22:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c4895861e6a9c2aa193de06aa492f796 SHA-1: df527d5b6faf51efaae448972c94f9bb978cd48d SHA-256: c3d3b88e5b9b80e4fe8cf58390782ebac286e89f63aa68f45d9d31fe69634503
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffine.ru/123?utm_term=breville+je98xl+vs+800jexl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5ff90bd89b583.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/jcT4gRU/tokaido_tsunami_gi_review.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/ibqwc70/hard_riddles_with_hidden_answers.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/mawubetiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5ff57a3321404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_6006a1003996f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7d9ca308f2.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/WMkCmjd/39508677645.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/zuzedoxusezotivaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fee66e537951.pdfIn PDF document text
    • https://site-1168148.mozfiles.com/files/1168148/cellular_and_molecular_life_science_journal_impact_factor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_60038c883f381.pdfIn PDF document text
    • https://site-1175642.mozfiles.com/files/1175642/piporovem.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/hjdif8o/ancient_battle_successors.pdfIn PDF document text
    • https://site-1247563.mozfiles.com/files/1247563/bloons_tower_defense_4_apk_hacked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fc89c65def7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_600b9bd5dd401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5fe8548f4dfe3.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/delatovakamisinijula.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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 5212 bytes
SHA-256: 0007402567297f6bfd1d1cb2df5e45ffebad2b0095be58a00d2f87f23adeba48
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 11204 bytes
SHA-256: 45240e3f7508419bd026219e3e100bf63841905299af92cd16d53893058af27b

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