Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d293f9c04c6a09…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 19:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c607bba60d894be75deddbe0a3fbba4d SHA-1: 29aef66075993a4036c6018732ce2af63ecd67dd SHA-256: 55d293f9c04c6a09a8df1d346e4398fb0b77e7e639b9fe5d38d89b258b46b6da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics points towards a spearphishing attachment attack vector, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=boruto+171+watch+online PDF link annotation
    • http://optimaglobal.net/ckupload/files/ziboxizavaguwagigamedu.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/tusobeza.pdfIn PDF document text
    • http://jawarakreasi.com/file/zibowinukikavajenasew.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/48748429005.pdfIn PDF document text
    • http://salwex.hu/file/35612931495.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///firut.pdfIn PDF document text
    • http://storemisr.com/uploads/files/wafufe.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/welebu.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30114073743.pdfIn PDF document text
    • https://norservis.com/files/files/roxilagirogebitanerasuxa.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/jajavasos.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/ditilurovasiti.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/volofujejovenodavuwa.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/sigakil.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/38452135449.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c7b5b4cb439f0ef7313a0f5159f449e1/29759797973.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/kaduzekibuk.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/24869372216.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/24647295463.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/50551249410.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_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 18176 bytes
SHA-256: b9c101224fff1bbb31e14721f22d75f2d2c6e0ee59984ad86d7b3d5362beddd5
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 10500 bytes
SHA-256: 17d577b0e2559ee05d64186c16c5b2ad8a00e7462ea172375a175a1f3456f242

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