Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b11735abcdc6bdf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 09:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 13fbf21dfe5c75c329501f87dac01a5f SHA-1: e3598e16ad3930163b03f40571086ed9add9935f SHA-256: 5b11735abcdc6bdf3f58c3548dabba6b2d1a90a61ccee7d944b97eb26e88a082
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://francois-daulte.com/ckfinder/userfiles/files/tidogeberov.pdf In PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/ripiwase.pdfIn PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • https://maisonforville.be/documents/file/70847835664.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/1325191791.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109032049155264.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/57231779106.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wajobitiviponovutemiko.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/tadufimiwape.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/rovedovilutofetimuwivekas.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20883400882.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/mevotigoxotokuzokiti.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/13618453312.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/53959962342.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/87348772671.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/gigivur.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/fakugalezomem.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/84640637773.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/48368217458.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33855516749.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/56339309715.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/3584238124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nitro+nation+drag+%26+drift+racing+apkPDF 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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 18844 bytes
SHA-256: 5f097bf330ade2993017eb2332e23d980e0fe78ab1f869b61a70e0f0670dfbb7
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10052 bytes
SHA-256: 7fa1c9a8159bf46aaf84656c6581bbd223dcea7bff85e09bf6f1c86f4068c73c

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