Malicious PDF — malware analysis report

Static analysis result for SHA-256 e379318a0274b480…

MALICIOUS

PDF

65.6 KB Created: 2020-11-10 22:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c09a6a27436805d77f13d07e772edf6c SHA-1: c52e174dc565ef3b247ed80a79e320ed8f4b659c SHA-256: e379318a0274b480ac5a7eb403d35d84a163684fb9b5f96a95585a6391ef1aa9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'trafffe.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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?keyword=states+of+matter+webquest+answers PDF link annotation
    • https://xekelubapakam.weebly.com/uploads/1/3/4/4/134499273/1099745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fa2b11f117b7.pdfIn PDF document text
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/e3a5ad624cbc99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f900f342e28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f8f88e5757a9.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/9653002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/360f1857-3ef7-4618-840a-0e14459b53c7/jaguar_x300_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/kowabujikafixafegipetil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8c5c68-5ddf-4763-b1ce-2bc695b775af/tejene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8171387-7427-46fd-89a2-1b8219bb4eac/bissell_proheat_floor_cleaner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/82785077978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90199109-0dcd-46ae-a90c-effbc0649a8c/diguzogalalamulivow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d924d1-626d-4641-8c2d-d955a95f6963/teatros_mas_famosos_de_bogota.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_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 5344 bytes
SHA-256: a4d45795892a6e2e0c47b211fc0b11418fb1dddfa302e2ca632d80c71397f9e6
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 9812 bytes
SHA-256: 7aad8b419fe9dcc8a32825d37cf89d48183aef57af75eb2a7cb10589b50885e3

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