Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6017bbaa34c23cd…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 18:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f3052ab5a423d49e4d20e02b79d4d3f SHA-1: b4141e81a7e64166c0032d71aaa0e2cca5823bf6 SHA-256: c6017bbaa34c23cd247750f6ae2fec55f7edb0bb0b26f6d823835f4bc9aff234
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked sites. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • 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://www.tramag.pl/upload/file/sorilunelajudodeze.pdf In PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/dewosavuwi.pdfIn PDF document text
    • http://idroter.org/userfiles/files/95454219377.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/33692949436.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/43942553075.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16320644661208.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nowuxiz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bc038892---kuparegarezaperasugudu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/56647338840.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/37622188.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nenujumitefitatowa.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kadeg.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/33718355374.pdfIn PDF document text
    • https://artenika.pl/fck/file/36912336931.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/pefurusumukigekosotaj.pdfIn PDF document text
    • https://baglab.pl/galeria/file/bafonirunozumoxodejifug.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/tigikesewaravojafopixakev.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/gobizew.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/33412297524.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109101456523845.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mezuvomenafirisado.pdfIn PDF document text
    • https://invest.pl/userfiles/file/21968511929.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421fcb074e3---30105885229.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/duratisevebanusato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+city+builderPDF link annotation
    • 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_off0000aedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 10368 bytes
SHA-256: 7ad36978615dc22cc08213ebde8af1c166ed1963e3777d553d05d86d6f53bc21
font_02_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 14416 bytes
SHA-256: e3f7d070077816e203b12c82e8621c620c593c88c4a3f9de58d43093fb92a604