Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb67953b03baf2f4…

MALICIOUS

PDF

67.4 KB Created: 2021-01-13 00:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c090883508e4f14efd3b77db188946a3 SHA-1: 81d45fc2828910025f019466e439846a1e90fbec SHA-256: fb67953b03baf2f442e52efd5674cae61fbdab7a61ae5ff8d87f3cc97dc4e82a
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary external URI pointing to 'trafffe.ru', suggesting it functions as a lure to a phishing or malware distribution site. The PDF structure and numerous links indicate a link farm designed to obscure the ultimate destination.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=fosmon+wavelink+51005hom+manual PDF link annotation
    • https://site-1239377.mozfiles.com/files/1239377/dozilanebiwomap.pdfIn PDF document text
    • https://site-1177068.mozfiles.com/files/1177068/ball_shooter_toy_baby.pdfIn PDF document text
    • https://site-1181123.mozfiles.com/files/1181123/space_battleship_battleship_yamato.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/ejfic1P/gigazosinujotodovorimile.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/ThaEuI0/mtg_secret_lair_extra_life_2020.pdfIn PDF document text
    • https://site-1177757.mozfiles.com/files/1177757/73356052316.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jefzhcJ/linkedin_learning_certificates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5f9a20de44ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5f958a0260e6b.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/ifjjhjh/sewofabub.pdfIn PDF document text
    • https://site-1172047.mozfiles.com/files/1172047/astonishing_comic_reader_apk_pro.pdfIn PDF document text
    • https://site-1172149.mozfiles.com/files/1172149/66595454505.pdfIn PDF document text
    • https://site-1178256.mozfiles.com/files/1178256/kumolojanu.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/ayyappa_swamy_ringtones_songs.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/lanaladu/abstract_algebra_structures_and_applications.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5316 bytes
SHA-256: d4423d9d20fb24b8fca7ad2cacaf3212fc4da117f4da86ba823ed072743f333a
font_01_sfnt_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 10772 bytes
SHA-256: dba24be105cc67d78f1af04bc0a485644cef3e32ee6752c04458285bda743f7d

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