Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2f761c70867e13…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 05:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 024d5c93c30825d68123ac312e87f5c7 SHA-1: 2172e7fccb465a5e6e2ff6f19924778dbbb012b6 SHA-256: 7c2f761c70867e139a5c97e3bfbd42fd5f42040be8e3b3a8ee4315f6fc9130f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This script likely redirects users to external URLs, as evidenced by the numerous URLs extracted from the document, some of which are part of a link farm. The PDF's structure and embedded content suggest it's designed to lure users into clicking malicious links, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://digireg.it/upload/67696151995.pdf In PDF document text
    • http://cplust.com/upload/serback/files/20210916051005.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/315b43ec66094b149f252bd543b267fb/9118815865.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kujigemidupamomekobugiz.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nomovalarutafiluvu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/23859374048.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161436360591af---50259004716.pdfIn PDF document text
    • http://moretonassets.net/userfiles/55322732451.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/wegawovini.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/15421894827.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/mamugifenometoda.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/wifivasut.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/biriwixevudofo.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vilemovaxogexasuv.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/senumodomivuxewawe.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/69131935829.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/91920166147.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/radoli.pdfIn PDF document text
    • https://ags-car.com/upload/files/xajutaparul.pdfIn PDF document text
    • http://goodnest.info/tctt/sites/aaa/file/losixub.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/11889282057.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/58271964893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=garena+codm+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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16428 bytes
SHA-256: 375228ac9cc2bcf6473f0f4ddda6ff38698818f8cf3dc1d37c8435b6cd87cb7f
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10400 bytes
SHA-256: 6b714e75257dcd53ce11822c94e6b1b82447c95d75e88ea08619bc5e1314c680

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