Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c796bfb069afa3f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 21:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be3a2c69bb944b217199d54c3eeb084f SHA-1: 623237803eda57a47b6fd61b4908021462b02fda SHA-256: 0c796bfb069afa3f3e3653b54b86c5d8fec5571489478b1bf87a99a8cdad3fb4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=kodi+on+roku+ultra PDF link annotation
    • http://bighost.vn/uploads/userfiles/file/jelubojaved.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/puvovupopare.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/sewuvoridotazaxu.pdfIn PDF document text
    • http://tianfonmm.com/d/files/79991587129.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/27773735908.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/25318015361.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb3da9f5---romokoxojigagab.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/32279329020.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/vozirifikutefononuvugunan.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zegolu.pdfIn PDF document text
    • http://recrute.fr/files/files/85004772827.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af3f0acc2---84497351613.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lerolabugoderazevufuji.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/42484468340.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/sibuvunuturuxasuguj.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/94022709557.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jadotos.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wosirudaguzaxisakuzubud.pdfIn PDF document text
    • https://ms01bet.com/contents/files/88051673244.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/91015826684.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/miwuxigezikuluderovut.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210918131139.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 17088 bytes
SHA-256: 6c3692b75252d7479cd5e571d027a3a67768eefae745bf797575be7e11e5e379
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10124 bytes
SHA-256: fa9264175e6be83827a39a0919fcee69f4d191648b6b10e4593c9098c8681f15
font_02_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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