Malicious PDF — malware analysis report

Static analysis result for SHA-256 3237631e1ad414dd…

MALICIOUS

PDF

73.0 KB Created: 2021-01-01 01:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db7c80df631cefa08574bfc4f1aafa6f SHA-1: da56a647be7f6a7cce9c3aaca988b9c89cbe7416 SHA-256: 3237631e1ad414ddd262a99e03052e53dc5e5ad6d2d597d903412acd4e9dac4b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=unity+2d+game+kit+infopost
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/6159482.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f9ba91a8cd86.pdf
    • https://cdn-cms.f-static.net/uploads/4413017/normal_5fbbf97ce9601.pdf
    • https://gudetopop.weebly.com/uploads/1/3/0/9/130969639/kajojokopan.pdf
    • https://cdn.sqhk.co/filovosa/gjVnig5/red_neutralizer_for_hair.pdf
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5fec252187a42.pdf
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fa59081a52e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedadokuti/defidupelitojazadibadagen.pdf
    • https://uploads.strikinglycdn.com/files/c11f842b-01e9-4dd7-a30f-da6f02d9c7c3/bavekikematopuvinidamewil.pdf
    • https://s3.amazonaws.com/kavalukato/factoring_trinomials_practice_worksheet_answers.pdf
    • https://s3.amazonaws.com/retisovojor/jijosozubopefufe.pdf
    • https://s3.amazonaws.com/fedure/cadbury_report_corporate_governance.pdf
    • https://s3.amazonaws.com/tedowafomaru/ludovisi_battle_sarcophagus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc23.bin
55c3e5ad6e8bb7f0952bf59dcb918f405c95e1623f795fda6b3c8b2672ede286
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 5524 bytes
font_01_sfnt_off0000defe.bin
664b95747144cefd1d07f9e6b9f102bce6b07c6895120812a15616a37e179875
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 10276 bytes
font_02_sfnt_off0001026a.bin
8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 16028 bytes