Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e046e614df583e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 19:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af6e4c94e0d0632e8d7113a54ac17a33 SHA-1: 79311371591867716381438f7c3ef7b81db0d893 SHA-256: 39e046e614df583e0df0f5db96619e7bf32a0dd1f5a08f541a8d2af6d4554fd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://inwebjor.ru/uplcv?utm_term=subway+surf+hack+mod+apk PDF link annotation
    • http://tieulongcopro.com/luutru/files/73079978139.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/wozokiruzoge.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/mugilig.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/zorenoxosazet.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/89720143733.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/lovifakobodopof.pdfIn PDF document text
    • http://jainfarms.com/uploads/36830372400.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/jokawowabemoxofimiwutim.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/31071482116.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/romuzibajopiresiragi.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/86474592706.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/dusemazejapobowoxosotutu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16133a505bba7a---fopiremoru.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/33532764499.pdfIn PDF document text
    • http://agilesolutions.in/uploads/69882516940.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/riwuwevodubusobi.pdfIn PDF document text
    • http://djpress.pl/Image/files/33723130503.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/24402577057.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/tenugodewumuzeverijawa.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gizovudagadisumavuxizovof.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/kuluxeruworosufuzevaf.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f32520c---30456896942.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/midigopoxirokoni.pdfIn PDF document text
    • http://01host.ru/userfiles/files/31445804557.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/62883413251.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wavugupibetoturadida.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/64794814607.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/35452381775.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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 11020 bytes
SHA-256: 5c800e834a86d2c706cf1e4259437a1782ff53b843dee02900bb3185ebed2cb4
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 17952 bytes
SHA-256: 7a819cabf73cf2c23da8eeb343d23de7674e86d691ddf98d6c1a2196635d99e8