Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b393cf8dcdb6f49…

MALICIOUS

PDF

88.7 KB Created: 2021-10-07 18:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82bffde8b46111c38eeeb8804ba3e127 SHA-1: 9cf51a11718a138170a1a3e3ef7a8af1987e5f56 SHA-256: 8b393cf8dcdb6f49add31f856f0390c6ac03c9952a052e6e199af942702de355
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 maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or spread links across many low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=4.5+watts+to+amps PDF link annotation
    • http://3gr-group.com/ci/userfiles/files/46927098399.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210921065049_973725.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/81981928444.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/86768162632.pdfIn PDF document text
    • http://isleford.com/filespath/files/20211007145610.pdfIn PDF document text
    • http://calienglish.com/ckfinder/images_store/files/63063833329.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/jozidapem.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kaligivepezigego.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/rekom.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/robetuxogusolazepadod.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/balasusigubogojexulaw.pdfIn PDF document text
    • http://superazs.ru/images/news/file/nakenig.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/saxuvelekezolomixenubinaz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/63486418929.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148bc2dab272---waxutirune.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/57900096928.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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 19796 bytes
SHA-256: 29d93b5d2945cf677d0fda75786b59686f7317a8f1656d4864e14aac8971ec78
font_01_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 10208 bytes
SHA-256: a2ecbef96e96a6e1b2d0b9a49a01d64c5171ceabc6dbc833f0b6126483bddf4c
font_02_sfnt_off00013dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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