Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4dc5478d9eb6e0…

MALICIOUS

PDF

69.7 KB Created: 2020-12-28 13:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 41bab97f40cb80df6056eedd1af80a3d SHA-1: 1747c765e9fe6cd889f6467fe8807228f014c64e SHA-256: fb4dc5478d9eb6e0b501b45d1c5fdacf8d3543646197fa3ffd95e5ff21172a56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest an attempt to exploit PDF vulnerabilities or trick users into navigating to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=how+to+be+cool+in+school+for+boy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5fbea1d371343.pdfIn PDF document text
    • https://zowozenuzaf.weebly.com/uploads/1/3/1/8/131857278/xeleg.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/gfgjrji/clock_face_with_numbers_no_hands.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/gdgfgcC/fimeterata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fd22791af887.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/2083850.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/gfgjJid/ziripekabarapepalorut.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/RGfi3ER/sobewulakakovos.pdfIn PDF document text
    • https://cdn.sqhk.co/babakobesuxe/jjbehbf/pocket_craft_game.pdfIn PDF document text
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/vivej-siluvad.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/wejalixex/ipod_classic_bluetooth_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/61806894522.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/60355817221.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/katakana_stroke_order_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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 5052 bytes
SHA-256: aa3b93f2f38c99e81beb04b2af5dcfc25d218a53e14a800cd383a1f67631ce91
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 10328 bytes
SHA-256: f985804e403be5b83f72e64ff26be2ba2e9df176bac1fd507f348d30fb751a22

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