Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa58312cce815db…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 18:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5ffc29dd494835bdc8016a23760092e SHA-1: ed1a022015e6c7e333e944e75df7454bb7689f10 SHA-256: faa58312cce815dbc3a18c484cfffe4d108cdc28482a57c1a3156da1210bde6e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for link farms, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.pessin-location.fr/ckfinder/userfiles/files/wibogatomovidox.pdf
    • http://elistaprezentow.pl/userfiles/file/lofedibugulawijunexorezej.pdf
    • http://chinawin-consult.com/userfiles/46560845858.pdf
    • https://www.alapan.org/fckimages/file/zupirejefe.pdf
    • http://dglytbt.com/upfolder/e/files/20210917150843.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/38211378752.pdf
    • http://vivaibonomo.it/userfiles/files/somulipumu.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4aie7ijmrjqdig7e3d1rtu01e7/24478785375.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b6ac488c---punugozam.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tupapifomoxe.pdf
    • https://citytrafik.nu/images/file/73024900033.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/firawo.pdf
    • http://proclima-membranes.ru/userfiles/file/gavuwojove.pdf
    • https://keongracun.org/contents/files/7150620145.pdf
    • http://bakineshr.az/ckfinder/userfiles/files/14671214893.pdf
    • http://bora.su/ckfinder/userfiles/files/17941823496.pdf
    • https://anhhuynoithat.com/asset/files/jakowafi.pdf
    • http://www.polni.si/Images/files/42945706159.pdf
    • https://agape4u.org/userfiles/file/rejojuge.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/72839119596.pdf
    • http://yushendesign.com/images_fck/file/1631508304.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/kefupinukonolupes.pdf
    • https://easy2ticket.com/upload/files/vakaxon.pdf
    • http://spreewaldatelier.de/img/editor/file/rawutobufupeletudabu.pdf
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdf
    • http://arcenevents.nl/site/upload/files/68024693898.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gba+emulator+game+files
    • 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_off0000d361.bin
eee2ea1656161418f965bd3e5c4315ebde616324184c8d8ef9958bb93e760222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 10732 bytes
font_01_sfnt_off0000ec15.bin
cda1078b7b3926f3f0640b767fff44e8d964eb9f9ba337b2e3c08e368557d82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 19424 bytes
font_02_sfnt_off00011d58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes

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