Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c55611b4562bae7…

MALICIOUS

PDF

76.1 KB Created: 2021-02-12 18:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9de8a2555fbc574ff7d4c8fd046c5fad SHA-1: 229d673dd2dc853901a11a1a8ec8e98222ee2294 SHA-256: 7c55611b4562bae79cd304e102f858004890b4dff2d38e72380b71ee51a8be17
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=fire+state+park+near+las+vegas PDF link annotation
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/a3a1223aeafd3.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/jc9ih95/96148965793.pdfIn PDF document text
    • https://ruwiwiteviporiz.weebly.com/uploads/1/3/4/7/134767377/rikuvuji.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/lijisepesodexovug.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/EAKQidw/zitidenakafokime.pdfIn PDF document text
    • https://voresefum.weebly.com/uploads/1/3/0/8/130813922/mefapunis.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/jimatukodibu.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/subezomuvo-joraduvadanoxu-xasibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5fc7edac6307e.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/lilavumimekiko_tojurowub_desexujivok.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/600d9dae13c.pdfIn PDF document text
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/gawelelinaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ff65eb83f8b3.pdfIn PDF document text
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/ec457dc8.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/aghhTIa/96506839418.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/gdrdOkM/rasapo.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/jfNPtjc/my_boy_free_gba_emulator_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_6016d5285548a.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5068 bytes
SHA-256: 7d9737db047a63fc5569f8d356896830dc5261cc6ff2f6f6086171dbf31db3c0
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10752 bytes
SHA-256: 8424799be7a1d9f0a86aa12d952a46f2edbbf99ed57159ca35590daab6a6c00d

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