Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99327d70ff8451e…

MALICIOUS

PDF

70.3 KB Created: 2020-12-18 15:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6a633a7ae0263f94a20dae44b28a7732 SHA-1: 183f6adcc38b30ac066b3fcabc9ba44cd9fa5b6a SHA-256: c99327d70ff8451e31062a8e43440ae931b69e69bec4bacc08a8f9ffb580cd92
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to unrelated PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://trafffe.ru/strik?utm_term=advanced+linear+algebra+lecture+notes+pdf', is directly embedded and appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://trafffe.ru/strik?utm_term=advanced+linear+algebra+lecture+notes+pdf PDF link annotation
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/difejes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd6e8503f4b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5fc8664d93520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fac45f366ac7.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/34c2929b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_5f9a3a38dbc99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed17f7cf8c75402b0ccf/t/5fc16ecc2dd96f59182559a5/1606512333318/the_paper_trip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5bbb32-69c5-4a6b-937d-c7fa4a2f0f8f/8062074235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ded89ed-dbcf-4f08-886f-46628a2a717a/14728826390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe241a1-22c1-4094-a3b9-553610929d32/23295666474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf62e79-294c-4878-95d7-491330ea3382/vebeweborakanemajuratuju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65167084698658e833d4e/t/5fd6c52a96ed101a3e4fe863/1607910699700/sqlite_db_browser_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b296a3c4-7788-41d1-bb2a-377646159a81/no_game_no_life_riku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ef906b97992eb55c42ef/t/5fce7c0db0d7447e4c223579/1607367702170/68821154377.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf90a9d104e5f152d7cb6/1606220055564/tv_tropes_terminator_sarah_connor_chronicles.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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 5512 bytes
SHA-256: 856d37999d9b99d0007234faf6339d22ff8472ccb15e73cf860abc5f013c73d3
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10336 bytes
SHA-256: 6495c05a3649a76ee9313ba9214bf5c63c76d22a932b37438ddf5bc07b989295

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