Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4c4669b44d68af…

MALICIOUS

PDF

64.0 KB Created: 2021-01-17 05:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f10a20b1336b83f29f42f1835f2516 SHA-1: 18ce09d6005294fe8c510babf0e1ec811026c8ee SHA-256: cf4c4669b44d68afa755d3bae884374e6ff2f68d95a1c158f3cf5c45edb003e5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://traffnew.ru/123?utm_term=big+brothers+big+sisters+kansas+city+events
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/toxifikileninawewul.pdf
    • https://cdn.sqhk.co/baxorurifina/aggjhq5/pioneer_smart_sync_android.pdf
    • https://cdn.sqhk.co/gegenosuzun/mihtDie/bingo_winner_certificate_template.pdf
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/7783909.pdf
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5ffbaf663c6c0.pdf
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/mupevezugibofi_sikesimutofidix_lodoki.pdf
    • https://cdn.sqhk.co/nasanoroge/hePjgGg/kingdom_hearts_melody_of_memory_pre_order_theme.pdf
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/gakitepakonuzo.pdf
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/446e1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lerezazo/journalist_vs_reporter.pdf
    • https://s3.amazonaws.com/jemisajoda/tixokufatona.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c5.bin
64901e5474e4bc0b412a583abaa66285c98566d3494fbf9c7061eb4f66dba13f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 5444 bytes
font_01_sfnt_off0000d45d.bin
71d797b6659ceb40a574b59805f14db1c1ce5875bacc2603e8019a211def7a97
pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 9144 bytes