Malicious PDF — malware analysis report

Static analysis result for SHA-256 773f23901563f807…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 10:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f2f335173ab1123f848ecc2e5738293 SHA-1: 91e9d32d7437318eee1d3f4f0e6bdf4cb36e893d SHA-256: 773f23901563f8073211137db7595508c0f7c01edbd72a21de5f6e8193899a20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to disposable hosting, which is indicative of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution, with the embedded JavaScript potentially facilitating the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://utpcomp.ru/uploads/files/34207815730.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/fujotegukusupusazebaxes.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/neserakobip.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/93121794592.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/komad.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zilexines.pdfIn PDF document text
    • http://gibisch.com/files/files/xalegatexe.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/75495242018.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915170053.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/v17t0nvvtj4i6tqb5gvj8s85m3/laluravanixezo.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/merewekakuvejopuz.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/26049469356.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/dufur.pdfIn PDF document text
    • http://bptramptour.pl/files/file/siwokumivaribokitev.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/12386857529.pdfIn PDF document text
    • http://sciattella.net/images/file/42358352592.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/tusazipixopusuxe.pdfIn PDF document text
    • https://brukspec.pl/upload/file/87996030967.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wurigodi.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061224022092.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba772cfdd---63561301561.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bosapuzamuxubu.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/sepojataler.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizin.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/68181991804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wild+rift+download+apk+obbPDF 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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 17756 bytes
SHA-256: e0818e7e0b73dadce29a397ffa58a767efb6ce7f44892c3adfbd1e7a1794aa64
font_02_sfnt_off00012176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 10504 bytes
SHA-256: 5650832d564944cf69d127ff9d1d55c9532cb78414a79fbd9cce7571d5a0a035