Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc4156768c5d2d6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 03:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1de6e88c279fdd52f875877e61148fd7 SHA-1: 2dd7165cd79ded41ffe1f46eb19a4a47e1b3eb5a SHA-256: ccc4156768c5d2d68b66f6b97cc4e6da4f227e038197c8910fae7ec3f9ad3b3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and a high ML classifier score, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using numerous links on disposable hosting, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://wastran.ru/uplcv?utm_term=tom+game+apk
    • http://lucchetta.net/userfiles/files/39571846706.pdf
    • https://hoangvan.vn/wp-content/uploads/files/matelijuxukabopi.pdf
    • https://ltes.tw-goods.com/UserFiles/files/48473343296.pdf
    • https://duvanco.be/docs/files/12310567480.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/aef50780bb0d03808d2ab92d216be489/babinogagebuga.pdf
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdf
    • http://mexxeopaint.com/upload/files/zidukalifizomife.pdf
    • http://stoka-saarlouis.de/userfiles/file/29690364535.pdf
    • https://friendsofmultisport.com/ckfinder/userfiles/files/wajazilamatitosuri.pdf
    • https://ubranni.com/uploader/files/mopes.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/41743269348.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/girabam.pdf
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/gexopuxabupipipawej.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/bamawamukasogage.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/22198475570.pdf
    • https://fotoprint.lv/downloads/file/liwixava.pdf
    • http://www.vegagastro.pl/upload/file/21536430389.pdf
    • http://luxlustry.ru/img/upload/davegeresinopizupibewom.pdf
    • http://7m-shop.com/userfiles/file/89439522248.pdf
    • http://innova-perila.ru/upload/files/xejalinazabobenodifusu.pdf
    • http://agro-partner.com/Image/files/wezigilevumesab.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/tuwufuxabitunobesidumibet.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161395c4865799---wajukuvosejopetipak.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_off0000b472.bin
28c6755042359d32e1b0fcd069b994ccc797d587e4f2f4be71cb65d39902e051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 14740 bytes
font_01_sfnt_off0000d95e.bin
46e7d0d18434679b2da895b0ce78498e1af51bed4e09219c57165c0da8d42535		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10044 bytes
font_02_sfnt_off0000efb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes

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