Malicious PDF — malware analysis report

Static analysis result for SHA-256 e762703807dbb97e…

MALICIOUS

PDF

82.5 KB Created: 2021-02-17 14:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 75b00700b6c92143db3b243d413f1c4a SHA-1: 847fd3ab211b37fba4db00b4bfe4d397d1076e5b SHA-256: e762703807dbb97eee0f00e7d9b39d8dabfebe571a0e4a645c6339a4301d3c91
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 0.9998

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://baarspo.ru/strik?utm_term=linksys+router+wrt160n+v3+setup PDF link annotation
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/4381719.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/8490690.pdfIn PDF document text
    • http://liketime.online/62923769513dz4a1.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/dovixima-nowoju-dimudo-sibedi.pdfIn PDF document text
    • http://beamorem.com/simple_buttercream_icing_cake_designsfz567.pdfIn PDF document text
    • http://afracheat7.xyz/4763112515620sv7.pdfIn PDF document text
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/630a94.pdfIn PDF document text
    • http://im-marceting.site/tmnt_portal_power_pc_review0pfbs.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/2156242.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/non_verbal_reasoning_for_bank_examsete0e.pdfIn PDF document text
    • http://maska-respirator.shop/18108264269w1hf6.pdfIn PDF document text
    • http://saxozumipelezip.22web.org/46268545795.pdfIn PDF document text
    • http://mnogoturov.com/39908204006zjdz0.pdfIn PDF document text
    • http://ketrovk.xyz/libros_sobre_plan_de_negocioso4o82.pdfIn PDF document text
    • http://lady-bug.club/bopisaxonaluto1cspt.pdfIn PDF document text
    • https://buroxaserojer.weebly.com/uploads/1/3/1/0/131070485/zaxipoposifawe-sipotub-rijuj-tokixajixew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidijunuv.rf.gd/tubipinezavebigivutiwudum.pdfIn 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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5340 bytes
SHA-256: 8908fde0cff75471b4755e6bd39dee9bbcb0c067b0da3d400e8718a1606e86ab
font_01_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 11016 bytes
SHA-256: 45db3758725bb4ed18aeab7718135b8f1767e2278044effa75ddc1f769fb3f9b

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