Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a72b567f258a516…

MALICIOUS

PDF

65.1 KB Created: 2020-12-21 10:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 479a2db986e0cd5a921b4a2b9c6cc944 SHA-1: 5af88f8cfffd6de85d9267018ce2d37747579117 SHA-256: 4a72b567f258a51613c700a5ace50bdc473efc65c878a4ff5c7b09e0b366653e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm. It contains numerous embedded URLs pointing to external sites, with one identified as a known malicious redirector. The document's primary function appears to be directing users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffking.ru/strik?utm_term=snake.+ever+played+the+classic+game+snake In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5fb302ef9a6b6.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/7aa21bf93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd974297699d.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/nasuxut_tujof.pdfIn PDF document text
    • https://gituwere.weebly.com/uploads/1/3/0/7/130740556/877231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fdc40ba68ede.pdfIn PDF document text
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/6917884.pdfIn PDF document text
    • https://gutugifowofe.weebly.com/uploads/1/3/1/6/131606479/wepabubavin_biretovotuted.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/5844181.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/jidosatikim/fesemunegatemuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/77441995796.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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 5848 bytes
SHA-256: a87ef30376c87e22c307033b6a01fdee706059b6980e8f1eeacd731ffab2436e
font_01_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 10496 bytes
SHA-256: bfee0112b828034e0ea14b4acf12ca4cedbdce1f6280e177a9d071c53a596752

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