Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32cf8cebc8461cd…

MALICIOUS

PDF

91.5 KB Created: 2021-02-28 07:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d08b1bb10d7d17acfddb3cda10ef5a79 SHA-1: 938f78fdee4473da8f485f98aa154a26e1c86e11 SHA-256: d32cf8cebc8461cd85f8a829364084b8a89907c46768a46f47b3a103d4fd1dbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=what+helps+acid+reflux+heartburn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5fcdf40e42e47.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/kixuduvuzofokulowexosubug.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/je5hjLR/rush_rally_3_ios_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/iODEjg2/16743644980.pdfIn PDF document text
    • http://cryogen.me/36081931380bp58f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fde2ec0b7164.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/f53iif1/pifurodunoxefanuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_6015c6e31eaa4.pdfIn PDF document text
    • http://mybestchan.online/art_and_design_evaluation_sheetluq35.pdfIn PDF document text
    • http://iceteas.space/259671306192vpqz.pdfIn PDF document text
    • http://watertea.space/the_gender_secret_wikipedia_movietmkve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd8150063aab.pdfIn PDF document text
    • http://distornyup.site/tigatabfguvu.pdfIn PDF document text
    • http://idealicaitalia.website/why_is_my_clutch_not_going_into_gear3rh2a.pdfIn PDF document text
    • http://websporizle4.com/32995924898z3flh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/how_to_do_spin_only_on_ge_washer.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_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 5464 bytes
SHA-256: 7e3141c8048a12616a767e1789b7cb3c851142483eb6a6d3acad6675599ddd34
font_01_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 10712 bytes
SHA-256: ea49c3a3b799ce02ac6fbcad8924c58bebbb48bcea3599482ad50ddcf2acd8f4

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