Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad72cbda809d5a3…

MALICIOUS

PDF

85.5 KB Created: 2021-04-06 15:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18b3fd797d778e404482413b6a0522ea SHA-1: 28f33a33e898bdc9354184426ee49cf4b296ee16 SHA-256: 5ad72cbda809d5a3a4a60f296c6d885e4543485a9a57070bb4a19eb479ab9351
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The primary URL, https://seumenha.ru/strik?utm_term=kidde+kn-cosm-iba+review, suggests a potential lure or tracking mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=kidde+kn-cosm-iba+review PDF link annotation
    • https://cdn.sqhk.co/pubodegosog/hCgjx9A/9878390297.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/u5jjm56/rush_limbaugh_health_news.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/bggjfhi/conjunction_form_of_while.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/molexulek.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/aWmuwpP/move_the_box_level_24_miami.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/2852082.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/dge4Hhg/private_notebook_apk.pdfIn PDF document text
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/befasiwatiru.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/sony_a5100_user_manual.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/4219e61fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/GkHrjaz/defensive_soccer_tactics.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/lmjgKhc/soccer_super_stars_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/F8Iii0V/mastercraft_tires_mxt_35x12._50r17.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/jeZhbzQ/dosixidopi.pdfIn PDF document text
    • https://lujututuvaribo.weebly.com/uploads/1/3/4/3/134339905/d4489e8d511.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/ggjmDja/gopivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_2c8cf14acd674020a0a51057362d3b9d.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_7c99a8016af44d069f41929ae3c8d810.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_d8d086f2f2344c4fb9be91fa1d39f606.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/besukojokilitobu.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_64c292ffe7414b1fa72c0946a5150257.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 5408 bytes
SHA-256: c29960a737e6d4e1e181568f6f351447d214dc50690a6b2a2c69da81badeaf0a
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 11136 bytes
SHA-256: 42d4109cca25d9a3f5640a194c161ba899724acaa5546a0bd35d995846cafef1
font_02_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2