Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c366e8d560b45da…

MALICIOUS

PDF

68.7 KB Created: 2021-09-09 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1169682dfdcb4b346a2074ba3656691d SHA-1: 99f1d82732805ed0ccd0f86f3af636b608708ace SHA-256: 6c366e8d560b45da19158b7761b38d1041bd34b31c63e605f3d664a0ea0dd666
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to a network of disposable domains, characteristic of phishing or malware distribution. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming its malicious nature. The primary attack pattern involves luring users to external sites via embedded links, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=the+rock+movies+in+the+jungle PDF link annotation
    • https://absoluteanytime.com/media_file/files/files/fedusasogamipirakijebo.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/kukizomazafulilegunib.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/nejogejugozuve.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/givejubozaxip.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/89328781751.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/kevatasorodenovure.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/67459696181.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fvc8dv16lt5j3r42mnhe0vk4qa/83035518367.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/53430848072.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5t59eq6ro72gj88sq7agve22s3/vimuboguwotoravenoxobe.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/bofej.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/taniji.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedovipu.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/32301205695.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090519043610981.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mawawib.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/32621624568.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/bexezotekosar.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/xizenalozimalefok.pdfIn PDF document text
    • https://eklyps.net/images/file/84652632497.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_off0000af55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF55 10864 bytes
SHA-256: 9677f2aaffabc08949dd315eb620818682e6d5e77bbaf275cfac2c1845499071
font_01_sfnt_off0000c848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 14952 bytes
SHA-256: a81ead49f96d0f0e4d963db42defe0a8e79b70e5161ad66403c640d92e5e1b01
font_02_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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