Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bfa2eef6161519…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 17:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86a575676f1c0d022bea1ce62a2dc13a SHA-1: b68726c55c97c48b6e5fa8be2219d0fa174f14f7 SHA-256: 79bfa2eef6161519b14ebca79dd0efc6c70a90c82ff748fe18dd3dfc5298110b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=best+death+runs+fortnite PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/713f868f88f925b773fc9a69cb5ee8ef/tinodiwodajevofanidota.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/libonideselesilulajovoxi.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/73020324442.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/nobep.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mefutaluv.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xuvudukak.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/debifomawujulexusawadobo.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/646558848.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zilalababakuxukabojisiv.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/pisofelurujuzotow.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/zijekojakes.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/ribitalubixeta.pdfIn PDF document text
    • http://tzsunup.com/upload/75761846215.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bixoneduf.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412a8f74a53---59183677462.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/fitiben.pdfIn PDF document text
    • http://hydrem.ru/images/file/wuwanofuwojegajamuvoli.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/tasazexamivofode.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nevuvidotewijutaboveselu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/zidog.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_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10556 bytes
SHA-256: 71979017d7785b89d7b63bcb111c256148221c37d837776fa0ce77c3448bcf18
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 17856 bytes
SHA-256: 2450b9379edfa277a666136cc888709e35d8f5d59c90a1fae61533a78d5da450

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