Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dcaefc59d55c4c…

MALICIOUS

PDF

56.3 KB Created: 2020-11-23 17:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: db27156f5b411104210282a06c0ec8b8 SHA-1: 187fde39866f1149359fb68e7c1082049fec6d02 SHA-256: 77dcaefc59d55c4c243aba08d60621d6d15a3db71baf94c43728b3e516d746d4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or SEO spamming operation. One of the primary external links, 'https://trafffe.ru/strik?utm_term=english+grammar+inside+and+out', indicates a potential phishing or scam lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafffe.ru/strik?utm_term=english+grammar+inside+and+out PDF link annotation
    • https://pibefabetanob.weebly.com/uploads/1/3/4/3/134376782/6171076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fac16dd4795a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f9931519b73d.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/6969699.pdfIn PDF document text
    • https://duxubekuzew.weebly.com/uploads/1/3/4/5/134506612/dosarax_betafe.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/9aaa829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_5fb28fa6cc41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5fbbcb34cddfc.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/pozokimepe/quit_claim_deed_with_life_estate_mn.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_off0000a417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA417 5196 bytes
SHA-256: 7b37d939b93dd4280726915e27dfa833d917ba9811f731155cf79015e7aad341
font_01_sfnt_off0000b595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 9256 bytes
SHA-256: 4187604056cb7dd0be32c3095e8f9f379b53c9cc784437e280078cd1cc655b87