Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5acd2b4d6183488…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 321ab66e9ec7ab601731e79f004e3681 SHA-1: cf707ff3f5fe1061ad017a17b47e027e3137631f SHA-256: f5acd2b4d6183488d21d674947c6c7ce1f56f459b05374a58708c495c01dc1d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=download+pou+unlimited+money PDF link annotation
    • https://intersensor.ro/v2011/Files/fck_upload/file/30530655363.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rcrs0s23maai7p53hvg19g54ao/lofivitama.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/26750640691.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a2a1201---zupowolajeguxelas.pdfIn PDF document text
    • https://mmszke.hu/files/file/vilemexujoded.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/dipas.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87268511991.pdfIn PDF document text
    • https://linardi.ru/files/file/66395760701.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/getovad.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/maduwanamenej.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/zexanaromepeme.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/29596640057.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/52098994374.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/likudebewabebo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/88084211993.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dezusanuw.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/62188417496.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/vitafan.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/ralom.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/43662670669.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/52415230983.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 17628 bytes
SHA-256: 66eaae66c08875e284f430d4a297860a559162e046045f9b6ff3075d328387cb
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 10588 bytes
SHA-256: 95bcd1e0a0d0bc798a0a0da4ed59453224a44c7d4f772996cd75f5c40d9decdf

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