Malicious PDF — malware analysis report

Static analysis result for SHA-256 23733ee8c345956d…

MALICIOUS

PDF

91.5 KB Created: 2021-06-08 20:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1cf7ca3eedc899220fca55470dfb6f8 SHA-1: c4dc6b17ada4c0d8c3338e96705e2e7fad47e7ad SHA-256: 23733ee8c345956d1185884741e4c11132f289afb6b69a1e3b7f2725bd1a935b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on strikingycdn.com and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=d%2526d+character+creation+stats
    • https://cdn-cms.f-static.net/uploads/4499999/normal_604bc012c0eb0.pdf
    • https://cdn-cms.f-static.net/uploads/4488135/normal_602573794869d.pdf
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/457b1e4277.pdf
    • https://cdn-cms.f-static.net/uploads/4485296/normal_6058b4d584ebe.pdf
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/wiratel.pdf
    • https://static.s123-cdn-static-d.com/uploads/4487208/normal_60b1bae49d6fb.pdf
    • https://kixusoboli.weebly.com/uploads/1/3/5/3/135394292/b2e26c3e844bef1.pdf
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/vulemuxuwaziv.pdf
    • https://guladusive.weebly.com/uploads/1/3/0/9/130969442/pogabofetov-weduzalavizosi-wifinuzoxuse-dokegadori.pdf
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff29e4716c87.pdf
    • https://static.s123-cdn-static-d.com/uploads/4373757/normal_60b248c0cd4dd.pdf
    • https://static.s123-cdn-static.com/uploads/4459466/normal_5ffdc339ec698.pdf
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/7553658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4826fee-8aa1-45de-b33e-8f1ba046d0a2/94631910751.pdf
    • https://uploads.strikinglycdn.com/files/2c13b8d0-65fd-4e1a-b7c8-26448536f7d7/do_wendys_french_fries_have_dairy.pdf
    • https://uploads.strikinglycdn.com/files/cffaeb29-b932-42a5-a232-15eb9ae46ec8/software_development_manager_amazon_linkedin.pdf
    • https://uploads.strikinglycdn.com/files/b734cf4e-e384-4229-8774-82435c128263/35216704872.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_off00012708.bin
bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 4156 bytes
font_01_sfnt_off00013537.bin
de1ce35df314e14abdd6425001564cb002f021bfe2cde5701c3de396b2c1b336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 13744 bytes

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