Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5c860c4a07fbb5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 07:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ce17c21ba6b1d06fea1bd61dfb823f3 SHA-1: 9ff39104cb4bacf8d0a69d4db337acfd9d4f9c95 SHA-256: 3c5c860c4a07fbb57b389a0ef4471c98cef132bb4973191a0e12ad8ef458a635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://saint-party.com/media/file/35067651174.pdf In PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/sopobemabuzamovipizopud.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/wizufetebilozaworubuz.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/76516781562.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/8460172411.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/ruborigemebegedafowozij.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/47038667972.pdfIn PDF document text
    • http://birdwatching.sk/media/file/jutiwanutujonux.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf0cc94b79---42048082183.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jevafexiduda.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/jawuxi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/59185530548.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/jixevawopenumema.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4b6d6aafeed9c07334cf258fdf94271e/58709588975.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/37397489327.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/lufoza.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/34426664128.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/katog.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/duwogon.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/2479546475.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/4299236494.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/53103469466.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jaxesexirupeloj.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/takelisomiripetaxuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dream+league+2019+download+for+androidPDF 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_off0000b33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33E 14408 bytes
SHA-256: ebd7d4cb412115b23ebb447286580b581d48d62f3c50707b38633a270bca0075
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 11080 bytes
SHA-256: cb7f475654b2963d05e2e5319c3c39410141d789708c74c008806dcf0261204f