Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5e48f22d1d888a…

MALICIOUS

PDF

67.6 KB Created: 2021-09-16 19:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 280f569f02e5b8a25899571c2e8b8a96 SHA-1: 20d96e7f8c645d8cc0439b7bfe2e8c90b42b1f15 SHA-256: 3c5e48f22d1d888a662f4303380ef21d081d7e7d86c3b365476637911d9c407e
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 numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final malicious destination through a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=freeway+fury+5 PDF link annotation
    • http://commandhousecreations.com/uploads/files/42251738544.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/sibexaso.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/jusatosofigekujemimof.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/77195645781.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/takugavab.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407b2f80378---nezozegebejosefizawo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339d1b34458---ruremirotisoxil.pdfIn PDF document text
    • http://msiutilities.biz/documents/kofunejot.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87707565129.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/63080672163.pdfIn PDF document text
    • http://4bx.pl/public/file/sarexenivovizazuwusuvixaf.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10479483644.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/58898042780.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/ditigukujunov.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/difidakepakapo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gerojarexelexosaxiwir.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/fuberega.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/94649669087.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/19468993451.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jagolitawojopagujepuro.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/83894301548.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210909_1F0D2F5A468F681F.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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 9988 bytes
SHA-256: 7ca90f78c0dd37afa021edac469ff8655df71f85932a619833c0ef593e030faa
font_01_sfnt_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 14888 bytes
SHA-256: 0b01ce2c9e753dabe6e53e03b8659b3d2808fd901c254a4e6ecffa082232b574

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