Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fff988e9a5cd9e3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 12:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695ddca3cdc790c7a401fdb62abcc36d SHA-1: 610df1afaa9a7cc2238ee9e7e87ead08020a5272 SHA-256: 5fff988e9a5cd9e3515e5e95cfc3c0de2635be7c1f22b6536c1df889410a3f3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://futsalcb.cz/picture/vtextu/file/figedipobuga.pdf
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/towaba.pdf
    • https://marbletreasures.com/uploads/image/files/86577590940.pdf
    • https://fullgame.hu/uploads/files/remofiwerejigizavoxisegu.pdf
    • https://volnynaklad.cz/data/file/kenakutadaroroxadirer.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zusumavineku.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/8323235066.pdf
    • https://nyirfa.hu/uploads/files/xamilusejanekezojapirujat.pdf
    • https://dogathermalhotel.com/resimler/files/55081385962.pdf
    • https://digireg.ru/upload/75639033048.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/lunaxijavedekox.pdf
    • http://driver-jazda.pl/upload/file/wesexir.pdf
    • http://euro-ex.com/images/blog/file/jivexujinuno.pdf
    • http://yachtales.net/admin/userfiles/files/wewewifi.pdf
    • http://www.centralperdana.com/file/4972564884.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/58239281660.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/ripajajerapezowusogizuwat.pdf
    • http://vitacanes.com/uploads/files/bozogupapeduxojodopoja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wallpaper+smartphone+4k+minimalist
    • 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_off0000cb9a.bin
35854456fc54abd1a596f1b2353674b8053ebc478bbd562d795fa677d7125c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 10680 bytes
font_01_sfnt_off0000e3f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 16792 bytes
font_02_sfnt_off0000fc0a.bin
0149fb011aa71a10deb28d58cfc585ccbf042e2d67a81886c9f02360323f1337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 17784 bytes

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