Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd36b3c6a7cfbcb…

MALICIOUS

PDF

96.4 KB Created: 2020-12-24 10:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 909e5bc411c0bfd2022a2938aa57c14c SHA-1: da4d5c145475154c7e568fb6905155c399aa5ae4 SHA-256: 5fd36b3c6a7cfbcb6ff43aeb5521bc428b20129201b88c4c1bd4ad5f4b8a75df
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 a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious. While no scripts were directly extracted, the presence of numerous external URLs indicates a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=gold+miner+kongregate
    • https://cdn.sqhk.co/duzemata/jfihhju/free_pinball_games_for_laptop.pdf
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/dokatemabupub_topigezer.pdf
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/4a6446b26780a.pdf
    • https://cdn.sqhk.co/mozopojugode/he8jj0h/wenaxowidalujelemezew.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/kamataziwukov.pdf
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fcff3dbe1405.pdf
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf07c280302.pdf
    • https://cdn.sqhk.co/zofukumane/OrifZs9/amino_para_pokemon_en_espanol_para_pc.pdf
    • https://cdn.sqhk.co/nebuneduzib/RKkpoQE/13194038934.pdf
    • https://cdn.sqhk.co/bidomutarili/NieZojc/nigodetujipurewisemefam.pdf
    • https://cdn.sqhk.co/jelivapizivo/gdRRnhi/zombie_apocalypse_organisms.pdf
    • https://revawovaweku.weebly.com/uploads/1/3/4/0/134013066/xejez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/345c6e1a-fe94-4a5c-b305-1ba60410abc8/kaderenokiwiko.pdf
    • https://uploads.strikinglycdn.com/files/2956b361-a4da-4259-a550-b5c9124d74a5/wayside_elementary_school_carrie_maxwell.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_off00013aa1.bin
4ba3a7da43f00d3de25dafae6aa0891b3c4c2c7f55bd3b66fa9ab746d20914fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA1 5060 bytes
font_01_sfnt_off00014bc3.bin
53a856cbabea4bbcac78ddd64f0febc002dfffb8dde560ad7dd84656b708af5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC3 12052 bytes