Malicious PDF — malware analysis report

Static analysis result for SHA-256 94905fee40cbf647…

MALICIOUS

PDF

82.6 KB Created: 2021-03-01 13:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6f909298cc30c05042182056d9e98aaf SHA-1: e7663c6b3c13e38c804d4df7c7c563d8580de03e SHA-256: 94905fee40cbf647c606f57b1a954b4fad392a4477332fabdad3f312c867eb7e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/award?keyword=basic+electrical+engineering+questions+mcq PDF link annotation
    • http://lnstagram-verifedbadge.com/24940904489rkhdb.pdfIn PDF document text
    • http://glawerry.online/bakilunolopigejutilevesu0fdbq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5fdc67a691c8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5fe57b3d25de5.pdfIn PDF document text
    • http://natbeach.space/pimorerewiwolaxabubezuduw4szd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_6018560fc9100.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/pidilero.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/povikubibuju.pdfIn PDF document text
    • http://in-step.shop/find_surface_area_rectangular_prism_calculatoryelg0.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/tirisex-rinix-divolanuxuvuz-tusawarugasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffa9a65e323a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_600f5900b1586.pdfIn PDF document text
    • http://infokurs.design/just_1_pic_level_99g3x72.pdfIn PDF document text
    • http://servempieza.site/50309311094tngvv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/wurulikodixejodamavum.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/cisco_vpn_client_64_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/atlas_copco_air_compressor_troubleshooting.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_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 5296 bytes
SHA-256: 91f8a80e925d70b4835a8d03af2f45701a4c671ce01e5caf319c7c28027c95ea
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 11204 bytes
SHA-256: 7d1329342ff8a10d168e537092c4f0561f266e348eeeb9f20b49f748bd43fa0b

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