Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30585f27672ad8d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 06:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 353293a981d75ca53dc497123fdbc020 SHA-1: 85da512aec8a6d8338af65997db1b237a7f6e84c SHA-256: a30585f27672ad8d335c4ecfaad328410fe9138ea68e7cc99a2e5e45a32e3ccc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=clash+castle+mod+apk
    • http://associatedreclaimed.com/userfiles/files/88243197218.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/45540517320.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de62c9ed2---zakevugipuludakubobu.pdf
    • https://genia-groupe.fr/images/files/23407074100.pdf
    • https://easypayindia.in/userfiles/file/mobofufafatomaxuje.pdf
    • http://wohingltd.com/userfiles/84680515666.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/judoguborazapegufirapew.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/poxotuveteximede.pdf
    • http://rulada.by/upload/editor/files/disaxududojubegono.pdf
    • http://qianxi.cn/filespath/files/20210906224704.pdf
    • http://suliaox.com/v15/Upload/file/202198167397105.pdf
    • http://pttaccounting.com/userfiles/files/lexilepitaji.pdf
    • http://kvarkeno56.ru/userfiles/file/rukozujofimisakekebixusaw.pdf
    • http://odumakus.com/uploads/files/ronetuda.pdf
    • https://a-guskov.ru/uploads/files/40698592078.pdf
    • https://tutorbolivia.com/userfiles/file/15280777303.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/973op0qp999bn99d6nm1ar8a35/sebobologepa.pdf
    • http://d-a-s.cn/userfiles/file/82922343480.pdf
    • https://martan.es/cenavarra_userfiles/files/41426502483.pdf
    • http://peterpan1996.it/userfiles/files/8415378568.pdf
    • http://greenglobepms.com/uploads/22376833556.pdf
    • http://lmleadmanagement.com/userfiles/files/jazubekigowom.pdf
    • http://morecoredesign.com/images/imageUps/files/89320910970.pdf
    • https://fond.ru/userfiles/file/83442980604.pdf
    • http://danchrisjewelry.com/userfiles/file/gakifem.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_off0000e359.bin
493deaa213f9dd1b2824abadd97b5a7bd8df31a59ca2851f13ce545018ddfe62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10604 bytes
font_01_sfnt_off0000fba3.bin
1b5620a87187441b964ff6054e60a1fa72da49cc7b5a517ec271fdf08a31954d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 17664 bytes
font_02_sfnt_off00012991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 16792 bytes

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