Malicious PDF — malware analysis report

Static analysis result for SHA-256 781e647cbabe7394…

MALICIOUS

PDF

72.6 KB Created: 2021-02-10 16:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 492dbb7ac814b5f1f35ba9f80b84a833 SHA-1: 9bb9f5d62a3e918f7e5155a2306e4ee9ffc83ff6 SHA-256: 781e647cbabe73942fa7a395369aff1337f1c739d5577dc94b30257ed94fe4c6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the PDF point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/aws?utm_term=annual+report+pt+astra+international+tbk+2014 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460045/normal_5fd1c0a73d835.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/fgjgjTP/download_game_evertech_sandbox_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/jPQibdj/kiribosixalil.pdfIn PDF document text
    • http://my-favshopf.online/pokemon_alpha_sapphire_gba_download_androidjczry.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/6576361.pdfIn PDF document text
    • http://haifaiv.ru/93563581674btyj0.pdfIn PDF document text
    • https://segoluremu.weebly.com/uploads/1/3/2/7/132740478/8564192.pdfIn PDF document text
    • http://martakkord.ru/music_mp4_tubidy537la.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/zjbqN7j/dance_magic_twilight_sparkle_dress_up.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/jiAjfjh/rojivaruja.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/fhb9Wjh/slots_machine_games_download.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/13019685968p496.pdfIn PDF document text
    • http://zhigina.ru/488589705899513k.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/9365513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 5420 bytes
SHA-256: 8492ad0b9b3e756ef3fc87b4bf3b2002cd23179fe0563cc05eef6ce859f07775
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10968 bytes
SHA-256: 0868fb5b0be5f0871230c68c7929b23d57384fe318a881f18a4d7c6353a3b16b

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