Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f834ec1ddcce10…

MALICIOUS

PDF

99.0 KB Created: 2021-09-13 22:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 163802fa8b01d997319c8dac68a3c6ab SHA-1: c8e212f067d01df939ab93887b8c19766ee44ce0 SHA-256: 74f834ec1ddcce1026e28c0731f908062c242f8a1cddca366d7ac6e4c660054b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or SEO poisoning attack. The document body was unreadable, but the heuristics strongly indicate the file's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://art4you.sk/editor_uploads/system/files/73415702183.pdf
    • http://dragoniresorts.com/userfiles/27576887636.pdf
    • https://fnb-concepts.com/images/uploads/files/4741754723.pdf
    • http://rebeccaosborne.com/uploads/43116609691.pdf
    • http://theclubburger.com/uploads/files/59513473010.pdf
    • https://bulendengin.com/upload/ckfinder/files/naxegexavukonajo.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/rodejelazamagukozu.pdf
    • http://gt-outillages.fr/ressource/site-image/files/sukugokabufuzofi.pdf
    • http://klgd.spokoino.ru/i/upload/files/33219795594.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136785e68f9b---ranakum.pdf
    • http://libron.pl/fckupload/assets/file/rogesikapemelata.pdf
    • http://muaah.ca/userfiles/files/38144232350.pdf
    • https://zoorichi.com/temp/fckeditor/file/semetoxogowogaxinin.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/51350681848.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210902_94E9AABD5B85917D.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/ladesevuropizamowinagemo.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zalitedem.pdf
    • http://studio-rivetti.it/userfiles/files/bobotozenovodizasutulew.pdf
    • http://bajajsports.com/userfiles/file/86396427522.pdf
    • http://tnshoppingbag.com/upfiles/file/sesinuju.pdf
    • http://szyqjsj.com/UploadFile/file/20210907025248034.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a513a563a---wuwolulokowalemageku.pdf
    • https://foundationkuzmanov.com/files/nuxid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=your+first+90+days+in+network+marketing+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001190e.bin
eb8811c127a7c3455d0cb62e557e0d1420bd44eb591a3e7308c8b4eed420d9e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 19104 bytes
font_01_sfnt_off00014adf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADF 16792 bytes
font_02_sfnt_off000162f6.bin
c00f1e7548aa4f8c6ef40066580c08bed1e86213a95c089e9565f01374293032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162F6 11460 bytes

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