Malicious PDF — malware analysis report

Static analysis result for SHA-256 313069a4f6887df4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 19:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8570ce4ade48f50e6203ce7f1d5f9fb SHA-1: 88419f1c98516e79e01fcb90fa08ac2a50aa193f SHA-256: 313069a4f6887df45d0a4bfd525744d87bc1cb78d629b35039023c53b5912b1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naturabliskociebie.pl/userfiles/file/78798210197.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/69b24707dce1ad5527a19b49096d4a6b/90878620942.pdf
    • http://umbabox.com/userfiles/file/pevuzojibonuxutam.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/80930984765.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/85269990615.pdf
    • http://kfgame.snailgame.ru/upload/files/20210901101708.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/439075439.pdf
    • http://box8websites.com/ckfinder/userfiles/files/sibituzokorexeziguwib.pdf
    • http://www.wiz-fac.com/uploadImg/file/nevebofofudugisa.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/27947419368.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947f1cdfad---rikuruwi.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/mafekoguvub.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/78183217897.pdf
    • https://turasmobilya.com/img/editor/image/file/71597838856.pdf
    • https://valgott.com/images/userfiles/file/tidelodofifa.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/36128666073.pdf
    • https://ceral.pl/ceral/pliki/file/10816201523.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xurarirojelisuk.pdf
    • http://bwlpsalisbury.com/uploads/files/33818558361.pdf
    • http://mabifitness.it/userfiles/files/15134443186.pdf
    • https://dlt-nkp.com/fileupload/file/xusexusegafozujakukog.pdf
    • https://egokituz.org/files/galeria/files/77688877566.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=codes+for+fortnite+skins+free
    • 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_off0000b946.bin
479dcc9b5a1e9cc84306d900efb573492ce00af266e54117c00d69731ba8c1fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 10260 bytes
font_01_sfnt_off0000d07a.bin
6b05c8c28a40e5ed5d37e04279c1ede49f5da12cd0cb15837b8b4c1438b79a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 17240 bytes
font_02_sfnt_off0000fd19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes

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