Malicious PDF — malware analysis report

Static analysis result for SHA-256 f098b20b5097f738…

MALICIOUS

PDF

62.9 KB Created: 2020-12-23 01:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de63e6a95eb98fc3bbb9fe30d101a663 SHA-1: 3ded096015eaa9dcb48ed75696d1b1f7c2762709 SHA-256: f098b20b5097f7385fe743f49e637758be750977929a4bc924f6a216862c1749
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, containing numerous external URLs, with a specific focus on disposable hosting and SEO manipulation. The primary URL, 'https://traffset.ru/strik?utm_term=winkbed+luxury+firm+vs+plus', suggests a potential phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=winkbed+luxury+firm+vs+plus
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/wonop.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/dfa24041.pdf
    • https://ropejanetim.weebly.com/uploads/1/3/4/6/134600341/4533922.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.pdf
    • https://cdn-cms.f-static.net/uploads/4467003/normal_5fa4559c35c83.pdf
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/7025942.pdf
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5faa62589045e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dowavelaxam/gopro_hero_7_white_user_manual.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf615afa04221c7118018e/1606377820060/types_of_soil_conditioners.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_off0000baba.bin
3693b7b5887e9b33075a3bff6698fd389c581251582590cda97148cfc94fefdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 5424 bytes
font_01_sfnt_off0000cd30.bin
23c4f3b6c6c184da3eba4c0afa6992a37f68fed0debbeed1fb5cf00ef69957a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 10088 bytes

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