Malicious PDF — malware analysis report

Static analysis result for SHA-256 041af6a21498ccfb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 12:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc928d88735532713f6c90cba476dcd8 SHA-1: 91097325f9dbdf805c786ec533d7b6c0ba3ea9fa SHA-256: 041af6a21498ccfb08c215244fbb721fa9073c61e547874cef9b41f7d983e8ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, functioning as a link farm to external sites, which is a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=letters+that+start+with+r+to+describe+someone PDF link annotation
    • http://teresachild.com/upload/files/kojipaxavo.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/41456989425.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/59551580114.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/moxaz.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/losixawavizekus.pdfIn PDF document text
    • https://tdfstore.it/file/fubabeteruzalisixal.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/fugepaketokazu.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/vofemomomupukibojuwolon.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631217411.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42859980179.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/woxakifoxelajoz.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/79620256832.pdfIn PDF document text
    • https://finliz.lt/i/File/19380780183.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5ea53855d1c0e9907fc00c0dd79ebd17/50382495905.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xalukivosa.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210914112318.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/7400055536.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/wozugodiduditeb.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109100006401660.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/73465479850.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/xisugaledifadepiki.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a86b762c7---nifefuwuruzojikesamuse.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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 17716 bytes
SHA-256: 12e9e0d4569d7592a704e1f1d1735d26c6483bcaad9e625baf69909fbe8b9389
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 10772 bytes
SHA-256: 9880b41f0abb44704dab25fe8580127b1eed813e80a927c2b984d59c676184c1

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