Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa5536279f6ab63…

MALICIOUS

PDF

92.7 KB Created: 2021-04-01 00:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c615c62f38c0b87a2133edced91b87 SHA-1: 517df742d112372cf61e9fcf19f8884d33522a30 SHA-256: 7aa5536279f6ab632845a07bfa99be014fb706d3703f28249956f2e7e6e4a0d2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference car manuals and the authoring application, indicating a lure to drive traffic to these external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=acura+tsx+manual+or+automatic
    • https://woruranevulabiw.weebly.com/uploads/1/3/4/0/134096732/bcc2d588bbee95.pdf
    • https://nogulumu.weebly.com/uploads/1/3/4/4/134476008/rebumer.pdf
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/d2f899c.pdf
    • http://fakexexu.sportsontheweb.net/newtons_3_laws_of_motion_video.pdf
    • https://cdn-cms.f-static.net/uploads/4443799/normal_602efc4cb2955.pdf
    • http://nipuxikupiluzep.iblogger.org/97129058988.pdf
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/xapopole_lakit_nofazojarel.pdf
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6039cb5a6accb.pdf
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fffc3ead6551.pdf
    • https://cdn-cms.f-static.net/uploads/4413575/normal_600dc574abe48.pdf
    • https://cdn-cms.f-static.net/uploads/4421042/normal_6029efb029fd4.pdf
    • https://vanasukir.weebly.com/uploads/1/3/2/8/132815930/kenopenalukewavebem.pdf
    • http://janafan.scienceontheweb.net/how_to_unlock_spa_control_panel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://liwukoxobumex.rf.gd/eaton_cad_files.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_cd100bf06d72457d8bcbe631d76f8738.pdf?index=true
    • https://b1a3a363-0690-49f7-9fdb-0cf2a37422ae.filesusr.com/ugd/f34823_0b6d551fae4941d59fea25fb0cfe23f9.pdf?index=true
    • http://tetomor.rf.gd/vilomowononitipezolaz.pdf
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a5c86e70896d4adcb537a18c55194bb7.pdf?index=true
    • https://e5acd528-9925-4355-98ed-6c6122c9c19a.filesusr.com/ugd/49fecd_6feeda1b09ac43aa96558707984b99a5.pdf?index=true
    • http://buluzapatevade.epizy.com/90709171966.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_15d3ad2f05fd49b4a21e83aeee6a2944.pdf?index=true
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f0c2a9422b6345d8bbcdc780bef0a954.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_55b6ace61760448a90cda412eb5f0fd7.pdf?index=true
    • 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_off000127f5.bin
7c54c22df950c4b10f884d7f4bf4681d341e230cc80195b3c91785d62a3f5b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 5000 bytes
font_01_sfnt_off000138e1.bin
a8e1052f9cbf6aec9004f7d8584c069bed0741a1314cd41dab3d18d2c835c407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 13040 bytes

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