Malicious PDF — malware analysis report

Static analysis result for SHA-256 b594ffaf12faf2fc…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 02:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 072da6b1b712d7853baa7ede788d26f5 SHA-1: dbd58517f437fa3a760a0aa71af5d5f71291c52f SHA-256: b594ffaf12faf2fc1a98bf62d6c17fa6437d5409767580967ae737a29fcbb1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://nomylo.ru/uplcv?utm_term=things+to+do+with+dirt+in+minecraft
    • http://ttmm.co.jp/ckfinder/userfiles/files/rajaxabesujopegisufi.pdf
    • https://srsatta.com/ckfinder/userfiles/files/90676767997.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/5147281223.pdf
    • http://onlineticketreview.com/images/file/kagujiwiluga.pdf
    • http://indago-rovigo.it/userfiles/files/kopuvagamupilo.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a2c35b2826658e9ee88c691cd3f73da4/27739351428.pdf
    • https://matao.ro/app/webroot/files/userfiles/files/mapafuduk.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/95132217495.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/15409820299.pdf
    • http://peak-experience-japan.com/images/blog/file/74963176528.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152a34024c0d---doxomitaranana.pdf
    • http://karikatura-kovarik.cz/files/file/25734662642.pdf
    • http://vivo-mebel.ru/upload/file/71433381108.pdf
    • https://taksis.lv/taksis/userfiles/file/54474541883.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/78287303098.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/25101382124.pdf
    • http://tucsokszekszard.hu/images/news/file/nitebalovolozudadatowul.pdf
    • http://mgrima.com/files/file/16341082892.pdf
    • http://etalentlink.com/uploadfile/file///2021092817462514.pdf
    • http://alnoorcity.com/userfiles/file/95179271117.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/19036510717.pdf
    • https://sgicorp.com/userfiles/files/wojabulavizepikujukoweku.pdf
    • http://suspensionestg.mx/userfiles/file/xedukufafesojobon.pdf
    • http://meditopthailand.com/file/6775858275.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52049878471.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/kirufepamidaxasigoroju.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_off0000b0b2.bin
8d18b3cd251975cfcb09323fb1f9c6d462bf515ffde577d1736f5db2d849a3a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 10928 bytes
font_01_sfnt_off0000c9b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 16792 bytes
font_02_sfnt_off0000e1c3.bin
c0636e698e3a3df5325ce50da75a954195ba5730695bf58e411a8f60cd9d6470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 15544 bytes

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