Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9a5b637a615f99…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 13:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a731e32d6fc5873dc1b7ad437642416d SHA-1: c4a0bf4efb55bf62afc10deb6ab4b5554e71fd1d SHA-256: ad9a5b637a615f996b593af45413e6bc9605133019be5061d49d16b9dcba776a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uclerbaklava.com/resources/file/pirolusaximodoto.pdf In PDF document text
    • https://benhgout.net/uploads/Files/file/jusodiwepiminopate.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/wegone.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/34124911025.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/dokaraki.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vomoninaboxobaxubibe.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/7380997450.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/13476446415.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/diwuludonopajogovadog.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/wunoju.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/87106048326.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/82297138560.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5973ef274---totepetavobim.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tupapifomoxe.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/lelaridejelil.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/98878869346.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sininododuwodarodujim.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dadakavewowakewasikofepu.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vanufuf.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kifuzogilupiwa.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/zixup.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/91615086388.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6df0b3a5c44ccb0664c57ed9e104c380/43544062562.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/naxupofatatidoxetoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rubber+material+namePDF 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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 18100 bytes
SHA-256: 3c322c6fd111b544dd4ec45aef8b349aa1f00a23b5057478bcee0507f8279f41
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10264 bytes
SHA-256: a34239b00eb3128f2be25588013a585b1b358ae1640ffa5ff72daf930177104a
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1