Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e037c15efaf018f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 12:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8260b4704d03b3a0c6a73eb7cb373a71 SHA-1: d3866cfc59aa6ddc7db3f7843ade94b6760e318d SHA-256: 7e037c15efaf018fba1f9515f389d47a8badc816b171650ba7d5d25ec2a0d581
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mobiliteit.nu/files/bamufuxijazokeriwofa.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/fefosefutajolivugipejuwoj.pdf
    • https://gulamanis.com/contents/files/xazovuvorikerovaz.pdf
    • http://picart-personal.pl/fckupload/upload/file/vegoteraluf.pdf
    • http://hexindechem.com/upload/files/72981000458.pdf
    • https://eledigitalpr.it/allegati/file/34600968106.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4b17ffe8---71877363119.pdf
    • http://hitecds.com/userfiles/file/86049212313.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/72375072627.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/03brrnvu91mlnp3tlktdjn8ff7/45710169456.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/latumodivavowidagewevogur.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/65589749070.pdf
    • http://elencostruzioni.it/userfiles/files/midaririwanalimurewa.pdf
    • https://nyirfa.hu/uploads/files/47229863493.pdf
    • https://pabxlg.com/userfiles/file/tobebaneb.pdf
    • http://tbeaindia.com/userfiles/file/23195285053.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/96879656179.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/74592167224.pdf
    • http://f-okinawa.com/img/tmp/file/fubev.pdf
    • http://stl-hk.net/userfiles/72525516515.pdf
    • https://ipic.vn/userfiles/file/67818901034.pdf
    • http://trungtamdaykem.vn/Images_upload/files/vonatedazepur.pdf
    • https://vnmmalta.com/userfiles/file/23771586570.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adwords+android+sdk
    • 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_off0000d5d2.bin
c0d0f0951c25f750a217ae3a48fc1ee5657248a2bfac8f713ea9688adae359db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 17852 bytes
font_01_sfnt_off00010474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
font_02_sfnt_off00011c8b.bin
6b777533c13f0701c487d04d76abeee168461613f5a787594253edf9dc91f1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 10124 bytes

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