Malicious PDF — malware analysis report

Static analysis result for SHA-256 717f7d12d17e6a6b…

MALICIOUS

PDF

98.1 KB Created: 2021-09-13 22:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 494c335ebd2397f021669e43368d3012 SHA-1: 9a33302fb79a424f650cec49300e64706a21b902 SHA-256: 717f7d12d17e6a6b44efc8e84d6fa60d07b95081cf7008e8f411ffc87e69cbdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://anticacarsulaeborzoi.eu/userfiles/files/tojeb.pdf
    • http://vip-cond.ru/userfiles/file/93573505124.pdf
    • http://yejiya.com/userfiles/file/38407318761.pdf
    • http://home-plast.ru/foto/files/29464838782.pdf
    • http://pro-roubenky.cz/UserFiles/File/paluti.pdf
    • https://thaiahpa.com/flash/files/5838808498.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134de830d850---69267748663.pdf
    • https://rainbowfurnitures.com/files/files/xevajivub.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91595380191.pdf
    • https://dichocungtoi.com/userfiles/file/62908929885.pdf
    • https://ubk-sad.de/azubi/userfiles/files/35866236647.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/sirubazolededidetubekasi.pdf
    • http://phoiinnhiet.com/images/uploads/files/vapokuxudipiwuzifam.pdf
    • http://cherryontop.pl/upload/fotki/file/40194769623.pdf
    • http://vesimport.ru/userfiles/file/39587696557.pdf
    • http://www.focitabor.hu/userfiles/file/kujonibabakigelisode.pdf
    • http://cropscipublisher.com/files/upfiles/file/pemaduwumuvulonuv.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/tibovusawogo.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/85969052975.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d4b365a6---zufabavez.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/tibamuten.pdf
    • https://wecareprogram.org/images/file/77120807530.pdf
    • http://doanekeyes.com/userfiles/docs/65010971176.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=promo+codes+for+roblox+2021+not+expired
    • 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_off00011875.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 16792 bytes
font_01_sfnt_off00013087.bin
b83f4e169a2fec2c99e7b58356a833b8f3474bebf8bb71e50a4ed8a4721bc016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 18552 bytes
font_02_sfnt_off000160b6.bin
f2502a04d82fd1b0b10eae67aad485fe354165ca3e6f287cb3a9838fe3688cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160B6 11156 bytes

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