Malicious PDF — malware analysis report

Static analysis result for SHA-256 f224cc38efd85a43…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 00:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f32df6d14c2c4e61b3bb346a4e2402fd SHA-1: 10ada20c50a42fec57f9c5817865fccce57dd203 SHA-256: f224cc38efd85a43ae894a6a306507f69529f1d55e1e86d23220d4913dff2575
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs further supports this, indicating the document's primary purpose is to redirect users to potentially malicious sites.

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://drafthe.ru/uplcv?utm_term=multiplying+with+fractional+coefficients PDF link annotation
    • https://commonlawhouse.in/userfiles/file/gafemowar.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/98627908659.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/rafovipuletawiwixu.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/8104895647.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/66757118539.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/98646775331.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/27349256841.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/67551034098.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/kugubenonobedem.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31861082799.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/wetofinegizufukubofuzuwa.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/lixorikanan.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a3608465---39258958318.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/nutokizibumajikekow.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/gotafod.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/27209710887.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/binilorovelubirogeteru.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/51260493753.pdfIn PDF document text
    • https://shibbirs.com/media/files/novakidetupisox.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/49961516168.pdfIn PDF document text
    • http://www.grifin.sk/files/87727838841.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/sunolegopediriwonuxox.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/velegarunakorilijebeledi.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/70720959029.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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 17824 bytes
SHA-256: 29e1b1bf788f139cbad61ecca55b0f9716cdf0c07b0d183cd5a2dbb4d9ec7c85
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 11052 bytes
SHA-256: b1e1d2d57854370f3a634baedf4bc3725f30e1cf2a04c9ceee2b70a607667280
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1