Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c4e28810198c56…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 02:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb9d689f0a9ed26c8d085a17f49d7a6 SHA-1: b29b2f7adef9a7fd3f7d47c4db44738a0b6ae517 SHA-256: 20c4e28810198c5674d97aa0b790005ca54c1d075fd1bbfbbb81b384829294ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as an image-only document designed as a lure, containing a clickable action that directs to an external URL. The presence of numerous links on disposable hosting and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the document structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=mrs+mcginty%27s+dead+pdf
    • https://tasivn.com/upload/ck/files/47523285267.pdf
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/kowezawatafabufuxiwavawe.pdf
    • https://pavillonwohlen.ch/userfiles/files/54456530076.pdf
    • http://runhouchem.com/upload/files/21732007878.pdf
    • http://kmkonsult.cz/userfiles/file/80948388149.pdf
    • https://nucamsa.es/userfiles/files/gisatafasavuwiweb.pdf
    • http://rainternacional.com/userfiles/file/22977056359.pdf
    • http://pozitron-s.ru/userfiles/file/fuwafuliguvevagi.pdf
    • http://www.pranabkumar.com/fckimages/file/4525114869.pdf
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/xarer.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c819a3c84---xukolapiwuwuti.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/taxibumewimusu.pdf
    • http://churchtextile.com/userfiles/file/3412360896.pdf
    • http://www.gabrielamaciel.net/images/content/file/5880973938.pdf
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/4523904023.pdf
    • http://www.bash.cl/media/file/zoduduxinimekasaneluvubam.pdf
    • https://webkapper.nl/ckfinder/userfiles/files/82728994884.pdf
    • http://kfoodntea.com/dataroom/file/bisixurozir.pdf
    • http://www.florentmaussion.net/userfiles/File/37518983610.pdf
    • https://renteci.com/imagens/file/solutepa.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/fajekezod.pdf
    • https://aadharshilaschool.org/userfiles/file/sevamovumatinigowafexu.pdf
    • http://4yoga.by/pics/files/guroxa.pdf
    • https://media-get.com/userfiles/files/maxaluj.pdf
    • http://energyexcess.com/userfiles/file/25126737035.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/wagitolufosipixoxeluf.pdf
    • 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_off0000b3a5.bin
55ed86c5c7b5b7876c561e6345921a74567ff26c0d9a02091e24304744fabafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 14392 bytes
font_01_sfnt_off0000d7c2.bin
2feeb7175b9999fd7a567edf54810b0f7f0ec02c92f26be9e84f33450982156c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 10940 bytes
font_02_sfnt_off0000f0fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 16792 bytes

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