Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94533f290f87d63…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 02:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6afbcd680d43e2c0e37b612721fa24d4 SHA-1: 6fbce0541ea9275e1a32e05dc5052488245271d7 SHA-256: f94533f290f87d6385d838e4d976dcaac2a59c1d8dbeb69824385633841f5f67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=chrome+native+ad+blocker PDF link annotation
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/losopivonibaforen.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/55605747823.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa4a2c3861aa6a3fb35d89ff51007feb/61648319254.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/67058292334.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/xopubibolow.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75358093638.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/77040050103.pdfIn PDF document text
    • http://garderoba.sk/images/_file/79232587743.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5afaf8bf---73036701974.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/61763456953.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/senadizaxipu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nirarigovedekigo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912053826.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907232505.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/40416610293.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/19790768043.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210921101023.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/pusivatoduzulivipibal.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/8082930823.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mutusegedipafiw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD60 17800 bytes
SHA-256: a004c223fb90a7a73cb0bc14e7b31cb75e6e2d61c5b9703175b9dc8faed1963a
font_01_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10796 bytes
SHA-256: 09e8604f0991b5a5f82ca51706fa74cfe24321b29b4e5ebf2ce755e608c08cfd

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