Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f9cd3328de9562…

MALICIOUS

PDF

67.7 KB Created: 2020-12-26 05:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: be3139418e439e4851fba102be34f9c8 SHA-1: 01c5fb3e62f525742f5a6d21ef2a1a849df4cd80 SHA-256: b0f9cd3328de9562117cf2ee37fcec4b68030f0f3f68815745ca16127e1fa71b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs hosted on disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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.
  • 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://trafftec.ru/strik?utm_term=ocean+beauty+merger PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fcaa58e74093.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/4871693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f8f9e617fbab.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/susixawexer.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/dGibdgh/42494089104.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/3970354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f9777dd7c6f1.pdfIn PDF document text
    • https://memesuxiti.weebly.com/uploads/1/3/4/6/134635319/8c1e97d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 5176 bytes
SHA-256: fe37bc25499ede95b422c9dd0bde68a0f1ea062ef11ee53efc7f57b61e8c3633
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10368 bytes
SHA-256: a6a45d5e7cda6803c32593fa4bc1382d847a900915d485e90dc0e90b9c7dbb16

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