Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e286fbfb50bfb1…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 01:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 955244c794127238863346aee09407fd SHA-1: 506a7461efdd4a66e7e27574dcd9f40a97b955a3 SHA-256: 13e286fbfb50bfb1f0b6a4bba04066f0acda22fde5ea4f777b23cacbc880bc9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=free+download+foxit+pdf+reader PDF link annotation
    • http://ankaser.com/userfiles/file/51724642174.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/zodevutu.pdfIn PDF document text
    • https://protum.se/file/92279690135.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zeveli.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/gidevoj.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/64894345976.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eac41da609---32674826073.pdfIn PDF document text
    • http://grupophi.es/uploads/files/64435633073.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109290543099145.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/puvarojafetabunorop.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/waxilat.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/nafakipizebavaxa.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/tiwowixuno.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/befikomujapararugivejanob.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/95aa9d1ff694e55efd768a7bb1e7dd09/fumopat.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/gezevosorowifu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pubuzaxanabumubumawa.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/32092571767.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/87284611260.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/gareluwibe.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/pafaselanumoxufebas.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10488 bytes
SHA-256: e9ac707d44440f004efaee8bb0ce101f92e7f3007938590654949ce33a67b211
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 18324 bytes
SHA-256: 402ef9bf2d889b674a682e1d6a205dac075ad3883359e8ff79af699224151938

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