Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de41a5997e5671d…

MALICIOUS

PDF

68.5 KB Created: 2021-02-27 10:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ff870ba8a10b2079ff74be02af97ad7e SHA-1: 2124fe518a7be8bf6f4564a9aee3cd14ca0c32a2 SHA-256: 2de41a5997e5671df2a093797c5ff36c744f7263d8bdb96a81989533262b32b6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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://nipisod.ru/wb?keyword=bajar%20gratis%20biblia%20de%20estudio%20thompson%20en%20pdf PDF link annotation
    • http://urolog.xyz/ice_lakes_game_guidexb1th.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6036a9bb337b4.pdfIn PDF document text
    • http://photoforce.ru/english_grammar_exercises_in_hindivwfqx.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/Ojg3dib/derodazatozeragirilud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_601f6b684086d.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/hKyWygh/59365096694.pdfIn PDF document text
    • http://andyhong.blog/jorovilisasuzhzic.pdfIn PDF document text
    • http://vipadminler.org/thomas_troward_francaisjdanz.pdfIn PDF document text
    • http://nashremont.site/scientific_calculator_gives_answers_in_fractions_onlinexa2gj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601d4b398d946.pdfIn PDF document text
    • http://cashfree.store/52059182565rvozb.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/48370066919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60136d8696a72.pdfIn PDF document text
    • http://probmaka.tech/happy_birthday_bhai_statusnjyce.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/mpmb_spell_sheet_generator.pdfIn PDF document text
    • http://goods-amzon.com/case_animatronics_hack_mod_apkamfgi.pdfIn PDF document text
    • http://vbruti.site/jikekipexefunetjeqw.pdfIn PDF document text
    • http://usechambre.xyz/kikovomizafuxarizovexobe8b3jc.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/37577653077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/poxagalisusepusegeved.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_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5720 bytes
SHA-256: d6b9cf891775a0b796a7c3a6e88331b5ab872ff4b9405e7aa3c7098063491d2a
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 11364 bytes
SHA-256: 8feb7e8835020ce3715d5cfb5863dfd72f76bdc10604525533feeaf2311a3b31

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