Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66fc684ba464b3c…

MALICIOUS

PDF

81.4 KB Created: 2021-02-11 08:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3f6ae74b218b80008ee0627b2076c512 SHA-1: 39b18caab9c8db7899309afd27446337a629baf5 SHA-256: c66fc684ba464b3cba0f11076616db89a1a86ee61caca0867090d31791099967
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs pointing to external PDF files. Several heuristics indicate this PDF is a link farm designed to redirect users to potentially malicious content. The presence of a redirector link to 'crophysi.ru' further supports a phishing or malware distribution intent.

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://crophysi.ru/aws?utm_term=rogers+cable+tv+guide+collingwood In PDF document text
    • http://trokot-roznica.xyz/95576617241xqhtx.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/2992Bhh/62023852391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_6009d7839d4fc.pdfIn PDF document text
    • http://goodsfor.life/nomo_app_free3eopa.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/9965409.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/UVgdifW/vodagegaxulukiwalug.pdfIn PDF document text
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/d160de972d64a9.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/jsiiJZj/95440111046.pdfIn PDF document text
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/de4e5e7d503.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jGigGjd/injustice_2_harley_quinn_all_costumes.pdfIn PDF document text
    • http://legendarycraft.ru/13577644166uv0ac.pdfIn PDF document text
    • http://opticsystem.website/forest_rescue_2_facebookgv3fh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawexelisam.epizy.com/zamujuvabevasi.pdfIn PDF document text
    • http://gizogebinide.rf.gd/5398601038.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_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 5408 bytes
SHA-256: 38bba4e9cedd1d669b8b44d59d990cb92c6e8346ac2d8540a6d8823a9ae7037e
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 11168 bytes
SHA-256: 740dad9d0e4bf4bc2a06082fff09ecd1ed4aa69b117ac4b42e72fdd859f93b7e

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