Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cccc5b33f14365…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf2727eb7a8c1b97d9e8b587fede6f20 SHA-1: f0c343c003f18188d55335af6796634ac66bb04f SHA-256: 24cccc5b33f14365bb8270ed973d625f47fa91086e88b8155219cc81638c87e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also acts as a link farm, hosting numerous links to other PDF files on disposable domains, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=windows+10+pro+1607+iso+download+64+bit PDF link annotation
    • http://azizavacanze.com/userfiles/files/vunoza.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/72418899569.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/42130081176.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/vabedag.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/poposerad.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/75569074292.pdfIn PDF document text
    • http://superbarter.sk/media/file/pafidaladazunamupen.pdfIn PDF document text
    • https://penzion-palice.cz/content/28709963491.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/dakaz.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/86557775192.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/38058302374.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/24969730530.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/zivozoxag.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/larijukajig.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/34050999084.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tojozukugeku.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/17160851804.pdfIn PDF document text
    • https://kueapem.com/contents/files/75061569404.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/18535669107.pdfIn PDF document text
    • http://dgjst.com/upfile/file/solavarawoxibegiv.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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 18112 bytes
SHA-256: ab2f8b3de2de4d878fd259947b373fec63556a6f45160dbc375737de7cf87139
font_02_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 10944 bytes
SHA-256: 57a3f7db4be7563d5bfc9ad43dcf13dc0f153fb99bdee69fa8e3c417f8acf796

Open this report in the interactive analyzer, or submit your own file for analysis.