Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8f6b4c18367f2f…

MALICIOUS

PDF

78.2 KB Created: 2020-12-31 22:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ec2b2203d66e434038bf5f1e6537bd9f SHA-1: bd76d302e4a95bbb90628d75d2e8426638e95272 SHA-256: ce8f6b4c18367f2f4dd3661881ece23617520f0473f1175dd4021920bff5c79e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful content or phishing sites, aligning with the characteristics of a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=steamboat+springs+weather+forecast PDF link annotation
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/1969681.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/a7427082746fc47.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/2bd2526cda83.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/ighbpE2/norizofamamarenoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/jgovfge/35148276311.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/9e2142993e8cf.pdfIn PDF document text
    • https://jimakujomeda.weebly.com/uploads/1/3/4/4/134438408/wivedewoginajawi.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/255257.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/fugewisexotoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/904649fb-6b87-4f94-8456-8d0db78e7033/muzesubuka.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/luduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f0c538-2c63-43aa-8fde-5653c3b975b3/66986629507.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5732 bytes
SHA-256: 8a7341d71b15dfcaa0bf191b1bb473221593490d15f5deeedf2218c12088d092
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 11276 bytes
SHA-256: cbf34cca03e3006de8d683bd4d7204a19e9336a57d591e1a04594b4fa467bcd4

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