Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4480e9f8cdbb7d…

MALICIOUS

PDF

74.6 KB Created: 2021-01-15 06:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ff462faff3337350267e08ad88501d52 SHA-1: 928cc9e36d76e85e94c4aba45b4f68107816cbab SHA-256: 3b4480e9f8cdbb7d2e0d7076d0eb6f3f5bc270166e81b374c9caacde16843dea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 26 other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious 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://trafftec.ru/aws?utm_term=financial+controller+salary+guide PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/VpqBz6y/gukexixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fe084aa63124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fea1f7056d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5fdaeae0a783c.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/gegjidd/subway_santa_runner_surf_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fa553bb879ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fe5eda9bd3de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460471/normal_5fe4225a9e2a2.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/todajak.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/numegubowalonan/biwisopepi.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/data_studio_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/gcse_science_past_papers_and_answers_aqa.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/54844049239.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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5164 bytes
SHA-256: 8a162522561cbfac0f3b863a7ba9e0f28e74151e065a73f1eeffb3aa9c63d0a2
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10684 bytes
SHA-256: 8bf9197592698b50bfe318cfc01f5471a0181977818259dd0812aec3d9794241

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