Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef5eb35e5831019…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 13:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1831e2a9a101728143c9cc7c754ad77a SHA-1: 99c8d0df5b8f2aa3ae9c4ba9c9e437917efb20db SHA-256: bef5eb35e5831019abf03e19fa1106c04316f93b80e0ac3ded3c668050fe311c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://vilenefex.ru/strik?utm_term=mn+driver%2527s+exam+test PDF link annotation
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/c8ccf989ca.pdfIn PDF document text
    • https://rutelixiriselop.weebly.com/uploads/1/3/4/7/134748314/botikewopaji_fejejotuki_vufekusitinezem.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/ramududafolu.pdfIn PDF document text
    • https://vokujesezi.weebly.com/uploads/1/3/4/3/134306830/4803730.pdfIn PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/taxuvubita.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/4243727.pdfIn PDF document text
    • https://gagofabujinu.weebly.com/uploads/1/3/0/7/130739012/lukato.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/9bf99b8817895fc.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/dowesitobuga/4373854219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154f1f63-d477-4398-8bfa-ac0646f5a2fd/elizabethan_sonnet_poem_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/sixajitidovem.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_9717f37efd394f648b3a1e008968c61e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/38112743733.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/field_of_dreams_imdb_parents_guide.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_80a55c34550b48e5b693779653916d00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/270f163d-cb4b-4246-a722-cd1d31050f2b/how_do_i_create_my_own_website_from_scratch.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_c0d9d1175feb422cbb4b10b52e72e01b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/rocky_bhai_whatsapp_status.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_6df050d2ba294e8eafd76711b7aec9d5.pdf?index=trueIn 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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 5108 bytes
SHA-256: 266ecac04eba8da23afcb9c54ebdfb2164137bb8fcac342598795129f37766e6
font_01_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 10732 bytes
SHA-256: 8b5b98c460e52e734a6fa9b3c57b8114ff59179c344ede1ce6d408ac0d55f53f

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