Malicious PDF — malware analysis report

Static analysis result for SHA-256 3186b2eb8c90b943…

MALICIOUS

PDF

72.3 KB Created: 2020-12-25 00:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8970294924d0f7ef5034530c755fde54 SHA-1: 2731bb8a52273d2228a83e6db00ba452975b17de SHA-256: 3186b2eb8c90b94393d0ab1e8fdc348ade448febc268387da7003698da2d03b3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafffi.ru/strik?utm_term=radiant+floor+heating+systems+in+concrete PDF link annotation
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/manisimixidedorafamo.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/suwuto.pdfIn PDF document text
    • https://joduzowulidu.weebly.com/uploads/1/3/4/4/134435513/4e493051cdbfb7.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/muninu.pdfIn PDF document text
    • https://liwujozixo.weebly.com/uploads/1/3/4/4/134497145/ceab992ece0f7.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/Cgcicjj/17023567118.pdfIn PDF document text
    • https://zuzunoginulori.weebly.com/uploads/1/3/4/7/134764202/sukinizibijipu.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/TUQQjfP/14734876107.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/bipepezuwed/77525130173.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/bedroom_curtains_sheet_street.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/aiou_assignments_autumn_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b845db37-0f62-4616-8254-3378475afbb2/38388289126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e7fdf6-8f83-468d-b4b4-b9e1cfaff92c/zumofefowigumolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53eed3e-6454-4d89-beae-8a6da1690801/43042663205.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 5544 bytes
SHA-256: e627dedc9e7cc5190fe89c99535665e3d3b87e8fdef763baba9763922263e16f
font_01_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10416 bytes
SHA-256: 1e2a9a4d56f393f6980f16624e4cd9e32bebd270068385f56b97f306eca3e46d

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