Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a496c70d4efaa0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 14:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0904cd9b43d848952f19331734456a1e SHA-1: 82f0a87a3cf2a53b8caf94cc000ff00936cded3d SHA-256: 62a496c70d4efaa0ee106d96bc9185e4ce2aae12be0e992f1aaf2d75f04dcb50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent related to URL redirection and potential payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139671543425---waliretafezodukujevidu.pdf In PDF document text
    • http://nenayu.com/filespath/files/20210903064816.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/javujabegal.pdfIn PDF document text
    • http://bulmarconsult.com/files/35006116553.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/58265126084.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1a8131ea---59753761257.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wavenovomidikosif.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/lejapamifujubenawupo.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/jijogizigixotofavolegaxi.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/fosonixabo.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/43968357804.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/49652172549.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/32215763710.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1669384452.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/musesaguligebudi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/69174492353.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wapugobemop.pdfIn PDF document text
    • http://chinazzjx.com/d/files/71340338663.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/binixisezovim.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/xomaserevanipefazakifepu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_101758_4413.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/nozokilenoze.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7447141108.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/boxokarevazelutomek.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kofato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+can+i+cast+my+phone+to+pcPDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 10684 bytes
SHA-256: 5de3435f4b654ca1edd73a470471d4c7d633f5f2666d0420b9dd55b320dca60e
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 19468 bytes
SHA-256: c1b334e46f6bf97eda672fcf0a7f23bbfafa9742a254e1fd050bd8a6d7dc0ba8
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1