Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c2691a3fbca809…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 10:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a32cd497295b8d1f19b93ea97d65f949 SHA-1: fcd8cd74cf5cedcc6e5d89e5859aacc006ba273e SHA-256: e5c2691a3fbca809f49f7bbf1e9e0fbc0c9a26ba6113e115ea9b860b20ebb460
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, pointing to numerous disposable hosting domains. The embedded URLs, such as https://ketchas.ru/uplcv?utm_term=sensi+pro+and+booster+ff, likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=sensi+pro+and+booster+ff PDF link annotation
    • http://chongros.com/userData/board/file/9240102795.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/lexozomi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/widukab.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/93801294491.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zefogapozibuxozi.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/62909408097.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mobinarogugowina.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/63209311924.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/zoduguxitugedesizipulupur.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/milirobibadalatubetalu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zibod.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zesawodazofizepirep.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/58901328487.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/dovilopejobedako.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d045a1df2---mipexakafavomu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/84573905206.pdfIn PDF document text
    • http://01host.ru/userfiles/files/56708199359.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/84503787501.pdfIn PDF document text
    • http://nfc.soo.jp/file/gojugaruxudigevujabozu.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/7973883001.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/85002318584.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zedaz.pdfIn PDF document text
    • http://birdwatching.sk/media/file/98854137193.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/95026323977.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613593af2e15f---zuvajagetopenupokelu.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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10660 bytes
SHA-256: 39a0a4ce27fa597a155bb8f72a1bc22a711ce6b677e2bbe9ec4a323d3179f59a
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 19376 bytes
SHA-256: a1899c07d5a27688117ca680a858f8cdfffc57375efd643b0497d78da7afa369

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