Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1768eb7eb4e6f67…

MALICIOUS

PDF

78.1 KB Created: 2021-01-23 08:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0b464de183ceb7363b15e0d2ad8c6637 SHA-1: b7cccdb2998e6d5cdc97ef371afebd22c0a900d5 SHA-256: d1768eb7eb4e6f671cd400225ab56b6c0acd734485197d29b195c023093cbbe1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The embedded URLs are likely used to redirect the user to malicious sites for further exploitation.

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?utm_term=judicial+branch+test+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fe4f9c9bdbe0.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/rupuzof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5ff1bd3adf3dc.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/sE1iahc/gebelomabuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ffb2c7749220.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/cWTgcnv/global_warming_definition_kid_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fc9bbde404ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490934/normal_6006671153040.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/hiagdij/77213851487.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ibpTrgf/buzzfeed_quizzes_age.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/ge9l7CQ/how_to_play_dog_simulator_roblox.pdfIn PDF document text
    • https://site-1226575.mozfiles.com/files/1226575/bringing_in_the_sheaves_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/Thr7O0k/mebujejij.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/eOhhbjh/gizonudunerugetaxejudali.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/pgehffp/vexutajotozabojewuniwugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fec5033e8b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fdc6eaf16a68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5432 bytes
SHA-256: ab239ba07d660b7c27481cfb099ae1220b469226564a5f90155345e531dfd92c
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10844 bytes
SHA-256: ed794b94770880ac2e656f4c8f300f95411e54dbfba842ca2ecf1f06c0f5c404

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