Malicious PDF — malware analysis report

Static analysis result for SHA-256 c416e84130f593e2…

MALICIOUS

PDF

88.1 KB Created: 2021-09-11 16:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c412fb8603c83e5da78e1ff8cb43fee6 SHA-1: e23ff4b8f446c3d62486752768d794fb0061d083 SHA-256: c416e84130f593e2eccf918ffcc92e38b0a0c7f0c78c4b5d3e29a7236824a06d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick users into installing malicious software or divulging credentials. Numerous external URLs were extracted, many pointing to PDF files hosted on disposable domains, consistent with phishing or malware distribution campaigns. No scripts were extracted, but the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site or download a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=scriptsafe+for+android+chrome PDF link annotation
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/buvotunilowisasopebido.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62040249762.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/47693290748.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/xakivajasogijipenigira.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/5401712697.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xejajireb.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/fuzabiritowuwuxinipofoga.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • http://mweb.cz/images/file/68123441753.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/37421006609.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/wazopulakazabafe.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/43010742814.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6c84ec48cbdb15d0ade7b7cfcdeedbf7/93957844653.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/85884421717.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/nikosamibunaje.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/gavodivefitugajizinulujoj.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd58e761d---leveko.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jojafitudotilebagutogora.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_870E51F68ADCF100.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mewilofujexexajeker.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/42118477823.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/85487336279.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sijugenut.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaxibimebu.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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 17992 bytes
SHA-256: f75ed650350de70d716d4351d16e38d2ff08242981c00c84419e37c4230e5315
font_01_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 10912 bytes
SHA-256: 16d81ccf004842d5e1b464ac4172e1d8e16004aacdc2022e19e993495b0d1629
font_02_sfnt_off00013b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1