Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6ccb62144f1e01…

MALICIOUS

PDF

66.9 KB Created: 2021-09-29 02:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdee3d43116e309c8920f6eed8084f60 SHA-1: 18325d4aecfaf2d2cf065b18a1341c0c2b394175 SHA-256: ad6ccb62144f1e01ae5f327246a4c643f7d850a93ce084ff18abc99ec9a4166d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation. The primary purpose seems to be directing users to external content, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://architettodrabeni.it/userfiles/files/6165081518.pdf
    • http://www.painters-restaurant.com/userfiles/file/vowikejaf.pdf
    • https://kvzriu.org/images/file/wawolupobofopuvimipimuzif.pdf
    • http://robvancampen.nl/userfiles/file/sojigamigafuve.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_87148867FB0DE4DB.pdf
    • http://oresteruggiero.com/userfiles/files/78049110871.pdf
    • https://interference.ajoda.eu/userfiles/files/josatuxegugimikovel.pdf
    • http://unibox.lv/files/text/tebibu.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e790d355b9bf564ed258384dfd6fb3d1/87693023666.pdf
    • https://ijtm.in/userfiles/file/satamara.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/13859136777.pdf
    • http://ekonopuntos.com/campannas/file/61304780561.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/rukobivumofulojelowodole.pdf
    • http://holland-ex.com/images/blog/file/41521114268.pdf
    • https://mannoorpally.com/uploads/file/mexan.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364a82c5af8---fifiliginiva.pdf
    • https://tessuno.com/upload/files/615393af23f64.pdf
    • https://indobaliart.com/sitefiles/file/junibug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+increase+phone+volume+on+android
    • 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_off0000a8db.bin
09829bd95877da40b8c5d6419eb381a46b5ba17efb06f98ad9977efcaa972b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8DB 14532 bytes
font_01_sfnt_off0000cce4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 16792 bytes
font_02_sfnt_off0000e4fb.bin
e4000fbae1ef53dae5f83ef69a0ec4039f1914b614a740d0c3b840848e997132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 11024 bytes

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