Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ccb83da79c8397…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 20:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c540d0e821da60397865df092222637b SHA-1: ae83664731becac081483506ecb93a86a4a0e576 SHA-256: b8ccb83da79c8397235d1fc52b5eb035e6a418f4539d04e3928e0c9a43c749a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=android+smartphone+as+webcam PDF link annotation
    • https://kaunas.cvzona.lt/resources/img/files/99253266347.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/65008615614.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/46859690009.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/jovuzaleroke.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zimuz.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nnrudt3515d3csqmep1a585264/depevibixiwi.pdfIn PDF document text
    • http://pneusmarene.it/images/file/45619887619.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630700444.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/64217203935.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614a19edc9f82---1326360724.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/fusox.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nukozajupukeman.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903200030.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jelagemo.pdfIn PDF document text
    • https://questyme.com/userfiles/file/jenibixaluxuxemenirazamob.pdfIn PDF document text
    • https://path.mn/userfiles/files/27874139320.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wovimelegaz.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210922_78570836EEB2F3C6.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/tojokimenofaje.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/45131146126.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/pubuzokogezup.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/71800330285.pdfIn PDF document text
    • http://blccy.com/userfiles/files/rerigivol.pdfIn PDF document text
    • https://rubfila.in/files/file/potor.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/34962666406.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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 17464 bytes
SHA-256: 6223cbb1a77c22256dfdeb955bd536342c6ba7573917e2b8789c9552349d7e47
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10940 bytes
SHA-256: 4a3b050ea2067e5f244a560fd2285d01d36990d333e75142a593a933e1855581
font_02_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1