Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e958a2744d91d36…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 06:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d660add6d00b10db13034010c204f02 SHA-1: c7925406a439ce3ce807d1af733d60cf4fca2488 SHA-256: 6e958a2744d91d36ea13f7ed408c1ee3ee1383ad4926dd4c55e5e6d0f2649780
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and numerous external URLs suggest a link farm or phishing attempt, aiming to direct users to potentially malicious content. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://prime42.ru/userfiles/files/12966970371.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/34533318343.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/kosanedurajupababoz.pdf
    • https://concurs-euclid.ro/upload/fck/zadaw.pdf
    • http://cbgnfinance.com/userfiles/file/xomubeluginaxixelisar.pdf
    • http://arebiatours.com/uploads/files/zobetedazejuxozipenizaf.pdf
    • http://cpghollywood.com/userfiles/files/penexizuzodotow.pdf
    • http://southerncross-ex.com/images/blog/file/suferosifipavitazugi.pdf
    • http://gusanhightec.com/userData/board/file/57493776926.pdf
    • https://ikorti-iao.com/userfiles/files/19603916224.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/gumixilogubefibajuzewexos.pdf
    • http://cadelupo.it/userfiles/files/boten.pdf
    • http://cisseo.net/userfiles/files/rupem.pdf
    • https://o-dance.com/upload/files/23299508332.pdf
    • http://4darchitecture.org/img/all/vomadefujolenugabafug.pdf
    • http://abogarestudio.com/userfiles/file/61188180705.pdf
    • https://lecormier-menuiserie.com/www/upload/files/poxagos.pdf
    • http://bjjiffy.com/upload/29827781867.pdf
    • https://oazapiekna.com/zdjecia/fck/file/976501902.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/sutovexijerilafa.pdf
    • http://fantalife.nl/userfiles/file/pimeb.pdf
    • https://asiantms.com/ckfinder/userfiles/files/6970551791.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/76980551388.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/79686888144.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/pegikaweledezo.pdf
    • http://theurbanbazzaar.com/userfiles/file/45603561042.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7unijfsbd1vmckvcbhpknisu64/wesuvowafovumenafezovim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+supply+lines+fuel+cheat
    • 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_off0000c8ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 16792 bytes
font_01_sfnt_off0000e0bf.bin
252d497f6e53b848d3bcd0fe2e1068b828ba9667b1678e2a897bbb04e3dd47de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 18020 bytes
font_02_sfnt_off00010eec.bin
feb35c843ca5f81060d22b95839cf022a08ae16c64487cea6316f4f927b17089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 10852 bytes

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