Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2335e218ef6b16a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 08:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe42a713ff4f084b3649d25bf3bfdaa4 SHA-1: 8cf3eca370af3692430eab0c3d07501b934bb903 SHA-256: e2335e218ef6b16aacf6efb9cd99a57656b9de0295cbd749fd079e066f0727b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to host many small PDFs on distinct, potentially malicious hosts, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://infrive.ru/uplcv?utm_term=download+automatic+call+recorder+apk PDF link annotation
    • http://abwingsjanaf.com/uploads/files/22684521656.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/mamikalenixigenaxerufab.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/90225420098.pdfIn PDF document text
    • http://carbonelite.ru/file/zimukenarewu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/97747145170.pdfIn PDF document text
    • http://skncn.com/u/files/82655270876.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/melitigixifodifu.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/16014779561.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/80257269162.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432a02a1d1---83246273334.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/fitojisov.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/13034012159.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/38887049042.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/wodokezafufajipakumagezu.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/76224675426.pdfIn PDF document text
    • http://intertravel.hu/_user/file/raxep.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/kezaxixemapodukezirebo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/93340404930.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26178063528.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/60243970751.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/43580819825.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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 10788 bytes
SHA-256: 5ba94bb95b2d4a7a9dd1c4ad847751b5321632f8ad4b0a4c31b8f40ee9b3458a
font_01_sfnt_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 17688 bytes
SHA-256: 3fe976b43bb8503d5230352f8db2382f4842e206071762550978bb6dd2ed6638
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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