Malicious PDF — malware analysis report

Static analysis result for SHA-256 f724cea43ebbb341…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 15:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a2e55fa152fe8ceb2d8d5a4ae3b2ecd SHA-1: f162e9700b93ca42837d8313784ca5509acad23c SHA-256: f724cea43ebbb341c235f382f2dc1f032add5c8d473294352c046e9acea9b7a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern indicates a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://bocion.com/ckfinder/userfiles/files/65891656082.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/romevoroketubabogix.pdf
    • http://servicedental.it/userfiles/files/zefumewagovugugoz.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630632852_da88072c6e.pdf
    • http://asavn.vn/uploads/userfiles/files/94824663997.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210903_92508320D54FEF3B.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/gomobuxosugizubexufula.pdf
    • http://sameiroeventos.pt/ficheiros/tomijafufimaxusekibi.pdf
    • http://taiwan-casters.com/userfiles/file/vudovulego.pdf
    • http://kawana.tech/userfiles/file/lajijabopimusaladuw.pdf
    • https://247christianity.org/fckeditor/userfiles/file/zawopubowotumixu1631037791.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8fd7624ead6416642433c6d1d3b77111/figekowavu.pdf
    • http://techscreening.com/userfiles/files/xotonujorigu.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/59819835084.pdf
    • http://msinziniering.com/userfiles/file/penisigekakufelita.pdf
    • http://xyr59.com/filespath/files/20210905045414.pdf
    • http://ttc-investco.com/img/files/fekupajuvigurudidodojab.pdf
    • https://zlato-stribro-investice.com/upload/files/nadujafofezowakija.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/sobuwifazofage.pdf
    • https://hunde-katzen.at/soubory/14836638878.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/femuvixalabogi.pdf
    • https://dongciao.com/uploads/files/202109031646491194.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/lovetadirowasokozofeparew.pdf
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/72935936406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=firmware+samsung+galaxy+ace+3
    • 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_off0000e2fe.bin
1092d0502980284f355408d4c8fb7e6e21540a922f97bb47d03055a268b2f078		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10908 bytes
font_01_sfnt_off0000fc47.bin
57f72337b18df2a64566882e286a5d5de3328679cb3ba4b4ea0fa0bee8b55341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 17836 bytes
font_02_sfnt_off00012a9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 16792 bytes

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