Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51d9a2d17d25127…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 19:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b0259a45f7b3ac133182bebcba0d7a8 SHA-1: 8132f6ff62ff9941dd97cd7e8e50a6ef4b9e8eaf SHA-256: f51d9a2d17d25127fa5a8f4db716301e9573441d6743c3182ca6c614296ab13c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a link farm intended for SEO poisoning or distributing further malicious content. The ML classifier and ClamAV detection confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://glovimex.com/uploads/ckfinder/files/40904053463.pdf In PDF document text
    • https://morabia.fi/images/file/73253957954.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/nekaxopivutedax.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/14748938015.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gakuzakedexokirawegokudul.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/fugagosakoguvuwuxes.pdfIn PDF document text
    • https://blokhol.com/upload/files/nofipeve.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/babazetofovabukusolukowag.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/nojodat.pdfIn PDF document text
    • http://rideco.hu/upload/file/52884264330.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/15297870561.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7a535e36913b6b17877700a61dff359c/30349787434.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/namofulobawinaf.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210924_F724E5669EB50036.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/40995186360.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/jenomijalofojilek.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/foteworavopedatojenepin.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/maguwonuxirejusanuvuzosad.pdfIn PDF document text
    • http://dytac.hk/userfiles/81191419077.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/lesokoxiwabomubusiwepow.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345e20683c4---dunizakunigixuguzote.pdfIn PDF document text
    • http://totoumi.jp/upload/file/garomag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=phone+flashing+software+apkPDF link annotation
    • 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 20212 bytes
SHA-256: 3be1182d22f5b1774f42ce28f9523cb07642c540b12c8f9cdc63dc634e16aa83
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 10816 bytes
SHA-256: 39cb0201794644c8291af68efa247379496aed8c2bd8f9ab12a858f0da36cb14

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