Malicious PDF — malware analysis report

Static analysis result for SHA-256 3304def438d33acb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 03:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a1bd8f4b4ccbbec80e610903a3d84a3 SHA-1: 90f465abe2ccc4c60db5d09af1a7deaaf39fa9b4 SHA-256: 3304def438d33acbaf2c3fcc32cc00cb79c296653653fdba709d9a20fd1f69f0
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, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high concentration of links on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=ghost+hunting+tools+apk PDF link annotation
    • https://doctmcooper.com/userfiles/files/xesanol.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vojasimosodujisesikanaw.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kalanatonupagiwizekikewo.pdfIn PDF document text
    • https://manenshop.com/upload/files/93913596726.pdfIn PDF document text
    • http://elitacasa.it/images/file/lowexasavadakeneporopile.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gopuwarogosisap.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/silepowunusidefibaser.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/riwisafogovikaduf.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/39663358364.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/zuzawet.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/29220069094.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/javozi.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/83269574661.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/diripuniwixivujezaxo.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210917_075900.pdfIn PDF document text
    • http://erex.hu/upload/file/buxasob.pdfIn PDF document text
    • https://polaria.cz/images/file/95793656647.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/gopamezigifudogojumaz.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vafetirexedoxabon.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zenaxeg.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909081503.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/tugusuzibudipuvifep.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/75862344794.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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10528 bytes
SHA-256: 5c05b26141b871b714c2e68e8b3d5206e1b8478e53cecafe5b2f690ced835e6a
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 18212 bytes
SHA-256: 12092fcf6d094ffc93d8a031a77863356bfb5816c5c4ea4f2420adacca427c15
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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