Malicious PDF — malware analysis report

Static analysis result for SHA-256 244652e7414f903f…

MALICIOUS

PDF

73.4 KB Created: 2021-02-20 02:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 46328205f1a9ce7ce91c853394d6dc3d SHA-1: 455c729e042de360480f1113dce27a3f5a7fccc0 SHA-256: 244652e7414f903f949e68a5c54b0c3ca522e50f584c9644ef6c215c9db34d92
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting numerous external links that appear to be search results for software downloads. The primary URL, 'https://seumenha.ru/strik?utm_term=autocad+free+download+for+windows+10+2020', suggests a lure for users seeking free software, likely leading to malicious or unwanted downloads. The presence of multiple disposable hosting domains and a high number of outbound links indicates a phishing or SEO poisoning tactic.

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
  • 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://seumenha.ru/strik?utm_term=autocad+free+download+for+windows+10+2020 PDF link annotation
    • https://jugatevos.weebly.com/uploads/1/3/5/3/135344520/kojis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_6015add45ce37.pdfIn PDF document text
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/dae10ec49c6149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6014d648665ec.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/BMhboet/the_weather_channel_app_symbols_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_6014590ded5ac.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/guwotiriwakaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_6004a4a1ee811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_602d8d251f4f2.pdfIn PDF document text
    • https://terunutu.weebly.com/uploads/1/3/5/3/135319236/2472aae35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fd18c2561ca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_5ff1b428c2831.pdfIn PDF document text
    • http://testersairf.xyz/piluwexix9deuo.pdfIn PDF document text
    • http://lasleymarkt.ru/seattle_washington_fun_things_to_do2ru92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_6013e89bee01c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374362/normal_5fef17f776b03.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_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 5420 bytes
SHA-256: 4afa4641b90fefd6734194c42e882605483282511ee97a6238b08df11bbed90f
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 10708 bytes
SHA-256: f3e1dec30a9e48be98406f0773ad8277eb9722a7846654032fb8d5a5bb6b87e0

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