Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d5c7b4fc7817d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c5ba79323d18a2cbb1444746ccea475 SHA-1: 9a9559aa1d1df17982204664802841d21b632473 SHA-256: 8c9d5c7b4fc7817d240acf39a56c73f17158f90b00b95fa3869df76aba310019
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mopron.ru/upload/files/zunozumipa.pdf In PDF document text
    • https://www.campacinter.com/image/upload/File/19507268225.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/56490572779.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fevofut.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ginurirojizotatemid.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rooarmj3vt7grjmmmvecuc74q5/larokozofile.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138115335c54---gitexunageragosepimipuw.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/58601588986.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/farakizesuxunapafurike.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/60427533449.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/72254536497.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40518676884.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/46941931599.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/86389528012.pdfIn PDF document text
    • http://fteq.ru/files/file/binonowavefuk.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/28018126371.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jadumidivatedetoxeduxebaf.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/50742538270.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/16627608334.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090513564090.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/suwinolomurojefagolepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+phone+suddenly+turned+offPDF 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_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 17460 bytes
SHA-256: 4b54c076cd08651b837b22e475504dd7e1006d458a400d85f8bf83850d3910d9
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 10548 bytes
SHA-256: e7c42117fffb18c37f032a7443da90ba1edce4e01e9050e31c1e806ce724bcbb

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