Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce471e21aac3fb0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 12:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34f2452d28e20dbc1c1552a14ee80d63 SHA-1: cb563f7697bc52c4364889ca24f3932bd4aded36 SHA-256: 9ce471e21aac3fb0f46c8840c52de54957eaba01bbf002c126f6999faa92aefa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high probability of maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://staropolski.net/Upload/file/71233244358.pdf In PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/bezoriwuleloz.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/256d0ec5d123f68d66a9f9cbbed58ca7/401675253.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/28562118417.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/83356298669.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/muzisu.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zemuxijijakomupusebil.pdfIn PDF document text
    • http://sql110.com/pic/25346571900.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d346b0ee6---batixoga.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/64799282709.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/57423618621.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210909_003349.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/ruzafeguneguvujeb.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/mixunu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/98082032439.pdfIn PDF document text
    • http://unibox.lv/files/text/94105898748.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/51568625506.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/lejobelalo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/pizozazuwuzonilekibiw.pdfIn PDF document text
    • https://kimcert.org/E/file/favolukex.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/73136707713.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/98260810437.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/menuliwereva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=doctor+driving+wala+gamePDF 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_off0000b1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CE 10696 bytes
SHA-256: b431511ec851749951780f23d79b7564c602997f48fa188af9d35339c3ae1a44
font_01_sfnt_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 15648 bytes
SHA-256: 179af697c944cd485deaf79ae3a0c39a973aa4fb6fe54d8b409a468abce6756e

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