Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb6a04e58b6283c…

MALICIOUS

PDF

72.2 KB Created: 2021-02-01 04:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1910e3b6781be656284d4c5218ddaae5 SHA-1: 8e6102f63c32edb95059e299108f946e0b33567d SHA-256: 9fb6a04e58b6283c8080b8a50223b8be92e6b139f81e0fce2153a7ee14b568b6
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link and a link farm, indicating a phishing or SEO manipulation attempt. The embedded URLs, particularly the one pointing to 'crophysi.ru', are highly suspicious and likely lead to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • 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.
  • 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://crophysi.ru/123?utm_term=eddie+bauer+dual+head+support In PDF document text
    • https://titajava.weebly.com/uploads/1/3/4/0/134096001/xonemiwanam-lutobidaja-pexazuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_601251b7be52d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_600b9c84ca0b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_600664a799b19.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/pusitarosame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fde835228605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_5fda758f004ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdd0112b5afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fc7b58fa872b.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/pixozorerad-majulodesal.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/2867857.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/gewisetug/adirondacks_fall_foliage_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/avery_templates_5160_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/63238377043.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/pain_agitation_delirium_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/xesorinudepa.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/a._v._a._alliance_of_valiant_armstm.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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 5144 bytes
SHA-256: 2698706a8e26c4ffabdc40e1dd6a9b265afa35090a3b362b78b82e1315f8cae5
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 11236 bytes
SHA-256: 61889233fff873f4c7a7775d101b9b4da984c46867d088d81407f60d9deaa667

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