Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1196068dc4133e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 13:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9262c35d632014ad55451304281ace01 SHA-1: f3fa4f249b22985442f5cc4f043bd6fe88620d32 SHA-256: 6b1196068dc4133e59764e163df1a76b2d276a777b41071d1e742c9432e8c4af
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically flagged as a link to an algorithmically generated URL hosted on a potentially disposable domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=what+is+the+best+loadout+for+call+of+duty+mobile PDF link annotation
    • http://fairway.cc/images/blog/file/wenorumi.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/21882009877.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/37683218866.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140088015442---55251779857.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/59971695175.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/pimaxagum.pdfIn PDF document text
    • http://beijingteye.com/upload/files/segomasa.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109172126337600.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wudotusinesafemubu.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xuwopu.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/gowinagurulimetu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/411540e44cc561da591c12fc7b492fa7/wonig.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/donejamolalox.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/25231387918.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109031159023679.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/78283464458.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/83249658956.pdfIn PDF document text
    • http://rhondachem.com/d/files/54393365320.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58877355455.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/mejavatew.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/84988801105.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/totoxipaxoxopovomaxejule.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/rujofalijinamepelavage.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/lufubedejedizufobanep.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/49816332664.pdfIn PDF document text
    • http://netflor.pl/upload/File/73298053297.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 20232 bytes
SHA-256: e5da59eaa46c298dc06c83e708e83070b8b396aaf4cd4b5884e53d551618c799
font_01_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10984 bytes
SHA-256: 6b4efa1e9faa287422f83716f74988cf036ad2fe185c41a89664301da0de0dd5