Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5eaeb0912fbbf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 03:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db572ab7bbdc51e0fdad0634eef9ddb9 SHA-1: 0cd7d68e56e5972cd6c4ca8cd7447f00591f67e7 SHA-256: 98f5eaeb0912fbbf2cec768702a15d349518f36646025173031fa822d1aaa369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to distribute or mask malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=pokemon+gaia+zip+download
    • http://star-transform-moscow.ru/uimg/files/78040288525.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/46729390934.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/jodavotifulifuwono.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdf
    • https://foodexgida.com/uploads/files/tofovizoxajufode.pdf
    • https://izometal.net/mm/file/45294018831.pdf
    • http://asea-admin.com/_userfiles/file/20210906034501.pdf
    • https://alpinashop.rudy-ra.com/files/jubebuvomutaw.pdf
    • http://surausa.com/uploads/files/sesowozovukeragupatad.pdf
    • https://eingangrad.ch/userfiles/files/13474350315.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tccdj71lhki8oqjdeteek5femt/61195302784.pdf
    • https://chataigne-cevennes.fr/imgs/files/zoboj.pdf
    • http://topenglish.sk/app/webroot/gallery/files/17430616166.pdf
    • http://luckysim.com/userfiles/file/teligufemalikofebapuva.pdf
    • https://jf-orvalho.pt/userfiles/file/gememixozadugugirofidiwuk.pdf
    • http://ritadas.in/userfiles/file/bidunekosu.pdf
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/xevotuguniguneluxukiw.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/188579cf6cbd5ceb1a345478bc655f5a/desesowivid.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/57905552343.pdf
    • http://sunnyten.net/userData/board/file/ridefajinidun.pdf
    • http://denkobarbell.com/_upload/files/fewafafigasilibewo.pdf
    • http://dralituncer.com/userfiles/file/likobizazifurobisuwem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d631.bin
993e4e0cd7e9854d2f7dfa56d8a105eee1a0deb2baed14b47afc6f4903daeca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 17932 bytes
font_01_sfnt_off00010498.bin
49885cb5f78bcac1cca842313fdbfc6edc90f3b29e3d7469456a35f39c6ad98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 10608 bytes
font_02_sfnt_off00011caf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes

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