Malicious PDF — malware analysis report

Static analysis result for SHA-256 673eef5a3bb5b2c9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 08:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 881af0600e93ce00af6d80a9e2394cbb SHA-1: c4a1632e918ddae5fe65cfedf677abbd1bc03c24 SHA-256: 673eef5a3bb5b2c93187b70ff3869dc5aef21defbf890f7dea990b198f9d4299
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic further supports this attack pattern. No scripts were extracted, but the overall structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kaptenhoki.net/contents/files/dejodewusagunato.pdf
    • https://undergroundtakeout.com/userfiles/file/jaziniworekibolowexuja.pdf
    • http://aurastaffing.es/upload/file/rezupurunamatabuvumoda.pdf
    • http://ageddfjtjgrade.pretty-match.com/upload/files/banabak.pdf
    • http://pi-consulting.ch/download/56087155103.pdf
    • https://cplastik.com/data/cms/file/jewutikixugajil.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146680e61fe3---nosifatatuvepateregijetu.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210906_E3C106C9E6C34273.pdf
    • http://xinchenfast.com/upload/file/79022463797.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/gezigobonevamiregot.pdf
    • http://studio70.eu/userfiles/files/64503840438.pdf
    • http://edbiji.com/uploads/files/20210905011314_844429.pdf
    • https://losaltos.com/wysiwygfiles/file/4363553465.pdf
    • http://donghozibistore.com/luutru/files/rivukot.pdf
    • http://donghobaoan.com/uploads/files/wakozafiwo.pdf
    • http://pdww.ru/ckfinder/userfiles/files/63718349692.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/93716377548.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/pizuduz.pdf
    • http://nprofit.hk/userfiles/buketaruwupusakexelezuk.pdf
    • http://crystaltrade.hu/data/file/30393609480.pdf
    • http://ambartakip.net/belgeler/file/84905593547.pdf
    • https://gilbertems.com/videos/file/miritugefokurizawopesa.pdf
    • http://pizzeriagiganti.ro/imagini_ws/motenakifaradidiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+add+icon+to+drawable+in+android+studio
    • 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_off0000cb6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16792 bytes
font_01_sfnt_off0000e381.bin
94e432bee33e60bdf14ae92a43ff3c8a0d7755985d638b4f1c9b47cc734554ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 17664 bytes
font_02_sfnt_off000111ad.bin
e15bd08f85d58515fc2251ad1790c014e923eb7d9f6488f069d482b7df52bd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 10680 bytes

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