Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fcf6bdcf61b5a0…

MALICIOUS

PDF

81.7 KB Created: 2021-05-12 04:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 67c92726eab1128ff9d80bdba71bebc8 SHA-1: 3c959c8e851f89812f4e6ed549a7251506976afc SHA-256: 46fcf6bdcf61b5a08985d87670a10a5739ee507d141ebfef4280b57a40441ca9
186 Risk Score

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 0.9990

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=what+is+yoga+asana+practice PDF link annotation
    • https://cdn.sqhk.co/wejagamewo/ijf8iju/49894346172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5fdf0f4f21046.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/fjewhe3/zirurelulugusitegirex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_602a8dbda5771.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/jerabimuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fd0674380475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_60125618916cd.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/4285102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_603576dc9f59d.pdfIn PDF document text
    • https://mujeganivavubu.weebly.com/uploads/1/3/1/4/131406781/jelokixinironavoduku.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/2354111.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/iifegg4/air_traffic_controller_training_usa.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/fepigifewulutiwovub.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/jujisenabeboti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_60157641a2261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff1c03f15a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5ffacfa0263dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6069965ac57d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_603a06aaa8a21.pdfIn PDF document text
    • https://gajebafanagifim.weebly.com/uploads/1/3/2/8/132815836/dc698127c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/gcviigh/worm._is_the_game_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_e5a17901f4214c7aa0c59a89b731a910.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_e6d7e7fe1a3f44558257b9e342eca0b4.pdf?index=trueIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_efc97acaf7294084a9aa17dec65b6876.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_9ad40c3547384262a9f600fd6984a2d5.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5280 bytes
SHA-256: 9b73aeb21f1e6289087c57497002f7a16038d69ecb7a1259652f273e2d283658
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 11248 bytes
SHA-256: 43362a18ba9d7ea6d7648f9316c61ae1f0697a5fc1c89801369329717d9c9092