Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c961b11a1811cc9…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 12:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 712662bbe4b3d93db1698a2c66c075f2 SHA-1: d0dc314a293273564febe02fe45e548baeb4709b SHA-256: 0c961b11a1811cc91d96581d4e3575c585d2c200d7006310ede78648bec107c8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdf In PDF document text
    • http://eqletstalk.com/uploads/files/202109020203341218.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/loturizijaretanudo.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/xubofazikag.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/72519772107.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/1920095848.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/takatujewu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/jagabaxidi.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82940359615.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/felalidufan.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/93413425683.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/tufixezafopebine.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10171051677.pdfIn PDF document text
    • https://rafautama.com/uploads/file/94420093303.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/86646397166.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/32177134559.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94232331274.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/fosofuxufafanevigalisib.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86181859958.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/80177486686.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/98312950420.pdfIn PDF document text
    • http://labonscafe.com/userfiles/lotibukafi.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/siruzim.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109050528371951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=crash+bandicoot+mutant+island+downloadPDF 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_off0000b8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 17820 bytes
SHA-256: 37693b1cba067656a62e9b2e3c79ee3d49334fe0525095e398641ae78861a8c1
font_02_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10860 bytes
SHA-256: caeaa8755b5730068494b4f26e28f9f44f39f7d0395a46ee9a90d779e692612b