Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa07d92b0c828d2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 23:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e5e91613f3e4c8e3e49e34ecc1fd41d SHA-1: 26cc2cb72049d49f5f805ec9986d6962565f3aef SHA-256: ffa07d92b0c828d274357b37384c907020cc7cbde3b5ec6c8d18fa8623c6d188
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=star+wars+d6+rpg+pdf PDF link annotation
    • http://nitecoreromania.ro/files/file/69444978530.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/detuviweme.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/55198056256.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/81724948271.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/60056580471.pdfIn PDF document text
    • https://udruga-invalida.hr/files/tavapadi.pdfIn PDF document text
    • http://askort.pl/Upload/file/59127777568.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109151254041093.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/lolewigagoxar.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/49772178950.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/33577286366.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/jawitijomotazuvonobi.pdfIn PDF document text
    • http://entrackintl.com/uploads/87554222159.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/87749732138.pdfIn PDF document text
    • http://shahgrp.com/uploads/mavevuwokonudodig.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/topigiwefaxufofanoz.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dokezofibanixajokusele.pdfIn PDF document text
    • http://tai-group.com/upload/files/vafixiludazepo.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/boset.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6bf2bb0891b86ffe4cfca6381d5b7c70/jodek.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/zasasosifitelelilo.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/40775830753.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109101146536883.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 18100 bytes
SHA-256: 904d1b86a85fcc16892cf4850af99be22592432e59ea1927be9a7d5a8442d5be
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 10508 bytes
SHA-256: ff0e28f19bc14ea141250d9d2ad911aeb8d983c355391c1e1faeb23b5608f83a

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