Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12543ba29acfbc…

MALICIOUS

PDF

61.2 KB Created: 2020-11-14 01:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96af4f055dfe2157c04f573ef4b607dd SHA-1: 77450f2df0dde3aaf5dfe57f9ce31c092dd2c871 SHA-256: 8b12543ba29acfbc31a08e00666970eddf7371ce4292541341643bb554807cb3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine rankings or direct users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or link-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=factory+balls+3+answers
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f8946b93a2e6.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fa3f2e2c448f.pdf
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/1172950.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5fa5b7889bef3.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5faef82e78549.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f8aa1a07cdf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejififimaketo/ccsf_spring_2019_courses.pdf
    • https://s3.amazonaws.com/susopuzupure/ignou_assignment_front_page_2019-_20.pdf
    • https://s3.amazonaws.com/fadedosi/98977139629.pdf
    • https://s3.amazonaws.com/fifomi/etsy_face_mask.pdf
    • https://s3.amazonaws.com/rixevozajixezos/hempel_avantguard_750_datasheet.pdf
    • https://s3.amazonaws.com/mejados/wanarosepoxek.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b255.bin
2d30744aba7a3749dcc1e4c94f86e4546d301d01f0bab5b2ee8ff5b6962f78f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 5244 bytes
font_01_sfnt_off0000c451.bin
db8c07f826d1e08489022b6d12848da34831c914957228db0a1cbf9f9f8ca5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC451 10648 bytes

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