Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0aa645d942cc6ae…

MALICIOUS

PDF

76.7 KB Created: 2021-04-09 09:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c11edaa0c977d6e3802d6e95bec4a879 SHA-1: aa6e91e96fbde53eee9e494a4bfb0384bd0ade44 SHA-256: d0aa645d942cc6aeaf431bf1580f0db90a2d034ce1995f6cf542f9a975de057a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a tactic to obscure the final malicious destination. The document body, though heavily obfuscated, contains a lure related to "Tokyo ghoul characters list with pictures", likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=tokyo+ghoul+characters+list+with+pictures PDF link annotation
    • https://cdn.sqhk.co/gijimexuv/jhgethh/fuzalejiweruzabonux.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ggSnpCR/12327753808.pdfIn PDF document text
    • https://cdn.sqhk.co/xabiximakef/jhijcgh/bejeweled_blitz_free_download_full_game.pdfIn PDF document text
    • http://bopepon.22web.org/73424757151.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/jhjdPKE/72783786182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_604ceba5c553f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6051b31287d9d.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/82555560348.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/70802876357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_603946566bd27.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/hjjaCja/54640226581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_6007516bd796d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_600d430199e40.pdfIn PDF document text
    • https://cdn.sqhk.co/dotusabu/jzwjj9S/88993843681.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/Cihhivy/neon_running_shoes_uk_cheap.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/absolute_value_worksheets_with_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winuvifenam.epizy.com/cell_energy_cycle_gizmo_answer_key.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/uk_supreme_court_brexit_decision.pdfIn PDF document text
    • http://pitodisile.epizy.com/crossfit_workouts_like_cindy.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/mimowadokenuwogefojirap.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5400 bytes
SHA-256: 6e8144087f68ac98229e11950589a38ce1cf81908e7c24b57d2d507d9f1f0c13
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11824 bytes
SHA-256: 483fc7234faa3b52b7cfbc00c452e1e82d5f83740eaa0fc0b5081ca372f4c661

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