Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f1acf9868c7cf6…

MALICIOUS

PDF

79.9 KB Created: 2020-11-09 23:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ef62c24bdc37b5d00d4cc22a2b8001bc SHA-1: 21ff99190150372f3e7504af912d711c53dffefc SHA-256: f9f1acf9868c7cf6fcd7640a61a97e31a80b56a241bb4280fb5bccec3b136333
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 it's part of a link farm. One of these links, https://trafffi.ru/123?keyword=muscle+growth+stories+roommate, is flagged as unknown reputation. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing trojan. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?keyword=muscle+growth+stories+roommate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f8dc387438fb.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6949257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f8b7981419c1.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/jibiribatobuger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f9e1bc0ed72d.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/kewuxejikiwe/61594277292.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/best_live_tv_apk_s.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/user_manual_for_panasonic_cordless_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b5243d-0d9f-4194-9581-cd3f954f5fcb/7298018801.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/filehippo_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/nepelukozetuxakonow.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/92108614632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072b2037-82fc-4c91-8945-d9f50b276d6e/jituzaripugixuti.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/law_of_multiple_proportions_worksheet.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_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 5308 bytes
SHA-256: 8f65019b20cec78525c92a63e9cee9463489cd9481caed70833c7ca64940d23f
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 10812 bytes
SHA-256: 4604807719fac5a788e9b3c765e37c015b234809e62e79e54044c6c2192bdaae

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