Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766ddbe9cc428ad…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 08:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57fbe82815f7e768830773d5f4146438 SHA-1: 513ef99fca0e47ee61948900c2f80783091201a6 SHA-256: d766ddbe9cc428ad80033736fad2a3d28d22f75314794d9f5d0dc55fefcce5ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=minecraft+free+trial+no+download PDF link annotation
    • http://dgelc.com/userfiles/file/20210904002144.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/bukakopoma.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/16c5db16beac793c2c82cf6122077d73/femela.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/84643323006.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/31058275380.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/totabolawetolagaga.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/26364e6f22cabb981aee6bd0d3e417de/pulumagopixinowevaxomilo.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/jivibumil.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/80603865758.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/vopudesitamunex.pdfIn PDF document text
    • https://shevian.com/images/file/2925353260.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dilipufisenokage.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/30317910988.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/45962070091.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/nuturimedugorenogigironit.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210903144751.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/90266248427.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/4629478755.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/wamuvobox.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/29413752480.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zopilosozaduweze.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/zulawotoxamonodejizukib.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_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 17532 bytes
SHA-256: a7e59eac69360c11ac8e347d1e13c8833036dab8a03aec7b9e37dbdff05b9209
font_02_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 10380 bytes
SHA-256: 4bf39955cb22706dee7bb670a4936ef379f0ca6ea995e100c5d6f38bb79b1d14

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