Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16422774c504099…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 09:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f067d25abfff80d689494f8ac055843f SHA-1: 2432f855b3345494087ec791cd943fff0325861b SHA-256: a16422774c504099b9b15a46dcfd679da1e4d5c289f19b6f036369e247fa49d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests it is designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://valkexclusief.reviews/app/webroot/files/userfiles/files/63079776901.pdf
    • https://fobh.net/userfiles/files/wujutekusudizuzofab.pdf
    • http://bfcy88.com/uploads/files/gomiw.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dolizikalirenanejujinomil.pdf
    • https://detmers-kontejner.hr/files/34282080798.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/62903421117.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/silepamenonew.pdf
    • http://kusistoconstruction.com/userfiles/file/79979408216.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/tisozurudaguxiri.pdf
    • http://kleinschadenexpert.com/userfiles/file/1335775893.pdf
    • http://ipceurope.com/assets/file/nuvelazazonew.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/44713208969.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5062c525cbc3680cd228a8c23265746c/vulabenelekugutofizilida.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/72208114739.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14058357880.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japarelemale.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/sinewaxewimosomeme.pdf
    • http://flemingdecal.com/uploads/assets/file/bizotapidatogifulan.pdf
    • http://qhchemicalsfeed.com/upload/files/kamopoxujonobezoresoned.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c37f8c32e---35384689279.pdf
    • http://nhatngungoisaoxanh.com/upload/files/monorerigokolokulup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mahakal+3d+live+wallpaper
    • 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_off0000c2a0.bin
6d350077a049db812463992eba3b67a8cf82debd2f145d3f45a4b53a8c19472f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 19076 bytes
font_01_sfnt_off0000f4c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes
font_02_sfnt_off00010cda.bin
653f3aa79e534217ea537d1ef8377abed688cc2b29ff32e3cdf9e7b07a4a994c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 10408 bytes

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