Malicious PDF — malware analysis report

Static analysis result for SHA-256 86973aa809204775…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 14:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36406197a40e9a0a79a8090e02fef8dd SHA-1: 9fdebfa5b95a87ac11a4f10651dee8dce92f61d4 SHA-256: 86973aa8092047759ceb2c2e0f3379d329bfa142d5871766cf1a8c9d0c4c6386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The primary URL, 'https://ketchas.ru/uplcv?utm_term=my+android+device+lost', is likely used to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=my+android+device+lost
    • http://abbaorphancare.org/survey/userfiles/files/80288975567.pdf
    • http://jikaramen.com/uploads/files/kusunomikefobojadarate.pdf
    • http://tfh-filter.hu/_user/file/64080720418.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nabaledojegorekad.pdf
    • https://zivotzaokny.eu/res/file/fakutopojoxoloveset.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xogusimegeranototixuvepu.pdf
    • https://soosekszer.hu/upload/files/99105578464.pdf
    • https://tspinstruments.com/cache/fck_files/file/wipikizutazesisiliro.pdf
    • http://pazarziraat.com/userfiles/file/vukiweninutopalowim.pdf
    • http://chromowane.com/userfiles/file/rijiderabaguximetuku.pdf
    • http://hamdannepal.com/userfiles/file/93850142323.pdf
    • http://studioturina.com/userfiles/files/90050605347.pdf
    • http://bmcnx.com/userfiles/file/16680868720.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/43849850745.pdf
    • http://uzks.hr/upload/datoteke/vabimumabimijowem.pdf
    • http://sjzhtchem.com/upload/files/jugejopebodanarinuvedud.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bazal.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/68369724093.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/golaja.pdf
    • http://botosani.ro/img/uploads/file/fezuwopewafabodibuwepad.pdf
    • http://compsult.net/userfiles/file/22880360716.pdf
    • http://files.ibiza-ferien.de/file/xokeforanulifoxejovonex.pdf
    • https://hongdung.vn/ckeditor/images/files/40880202319.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 16792 bytes
font_01_sfnt_off0000d792.bin
26f86ce145c2074fbab9fd3da7475772525ccb10a5e0fe30c83881273a70786c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10536 bytes
font_02_sfnt_off0000efb0.bin
ec8fc5486415b820a6b2d5edaf7329b549981a49b7fab04bf0032f1fb4747b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 16780 bytes

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