Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c277c7246356ab8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 23:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1290628d702b2db2dda02ca70060bea SHA-1: 1198915d220a76999ef2be04ab826fd14418b807 SHA-256: 0c277c7246356ab85a53b6967829bc054bf10520d9c9b784e4e1b719f5da8ecf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often implies JavaScript execution for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=mortal+kombat+7+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb94912e5e---kidezumojafotamawikod.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83252149650.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911060135.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/16907059754.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/97720970390.pdfIn PDF document text
    • http://megalaserasia.com/upload///87631347806.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/puziwadulusesologiwusojes.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/2065688046.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84502589853.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906172042.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/29425907193.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dexisimopokotuvabavezozem.pdfIn PDF document text
    • http://heizler.hu/files/file/73728021198.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/babazetofovabukusolukowag.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93268812022.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/rexarowi.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/zofaxamu.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/fobag.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/50497152250.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/98980994129.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/67900272872.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/66668245906.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/982a3satjf8n44i6q7jdr9foom/kalarebajum.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/ratit.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 18672 bytes
SHA-256: 6858678cc3d5427e54b78bf181efea5e429921c3d9164e4858c9995a87ceee13
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10192 bytes
SHA-256: ed0a280b53693a26d57193291c8db1b590d9bbdc82f9dd6e9867703ab3f54498

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