Malicious PDF — malware analysis report

Static analysis result for SHA-256 615d21035eb7d7f3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 14:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c9e174372e17c986dd97b97f75d028a SHA-1: 5c1db08f62f05d797a536f898bc08f82cfc92eb4 SHA-256: 615d21035eb7d7f31a003ef2ac24ec72e9fe07135bef824bfcfba0f7fa77bb2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yifff.se/userfiles/file/jusadunobirow.pdf In PDF document text
    • http://kavtas.com/images_upload/files/fesanenujemilofatenapa.pdfIn PDF document text
    • http://iknow.pl/files/file/kowebutulagusurev.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/babowerusodoxebo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f465995d7---15965767113.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xosagekatafebariborakeso.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/86275413802.pdfIn PDF document text
    • http://pmke.cz/pictures/files/bafusawatitotawuvijagajoj.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/62230623098.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/feligi.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/61590609733.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/37994144638.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020553592596.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/94373554131.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/73390780470.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/kirizubepulakagap.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/66419495436.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399507186c1---magutafapukoxawukum.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/92706991385.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/26629864770.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21618491033.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/wumager.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fatukinagabukemuful.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/gokozikixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=extreme+car+driving+simulator+2015PDF 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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 11392 bytes
SHA-256: 3c6886c473671e27ad26853543b9ddcd394fc6ed8c2ab10b01c217efcef0df1f
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 18220 bytes
SHA-256: 55e724d7c10b0526479dc9d87b710587c3be8d4a26c005fd9266a1685e3d950b