Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce340fb97befe89…

MALICIOUS

PDF

85.6 KB Created: 2021-01-02 09:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ead321e3fb703703c382d55fe29ca21 SHA-1: bf5705ff732219a82f2c884a0a48169341df69ea SHA-256: 6ce340fb97befe8986dc34df07e0e66f0cf33db361a7457f6cc092c0e729b493
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'trafffi.ru' being a prominent example. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=jefferson+salvini+randall PDF link annotation
    • https://cdn.sqhk.co/nopawuwam/hbjaCAv/14679672928.pdfIn PDF document text
    • https://nimivakovi.weebly.com/uploads/1/3/2/3/132302999/soxidijaw-misafaxofovupu-gatubajikozaz.pdfIn PDF document text
    • https://tudidufagul.weebly.com/uploads/1/3/4/6/134622529/puvizolo_kumozaxelu_limuvenaduxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8a72c5a9e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/hf6jeDN/72690281167.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/eNK6jge/79629092996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f983cb36ad4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_5fb466e79695a.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/fEvifge/play_dice_game_10000_online_free.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/larijukage.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/kezobuluvik_luwataki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f062ff72-fcfa-4574-b507-944ffa127612/bienvenidos_a_la_clase_de_espaol_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b2988-da70-4392-8ffb-4adcbba5fba7/48287848983.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 4660 bytes
SHA-256: 4f02e91c727c2146dd3417c6154d55c6d9a6af6a8cc5035a5e607e497a688030
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 12256 bytes
SHA-256: c6cbeca8ff85a9a3a78effd5c9d8399308ac4a6126696617b5accba1674cac23
font_02_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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