Malicious PDF — malware analysis report

Static analysis result for SHA-256 948f48c7b96b3bb6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 13:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89b6e9614851a1cb80556eba920ddf8a SHA-1: 39de21b354c927fa35b24a62371dd267cd78166e SHA-256: 948f48c7b96b3bb65f2b356f031eabad1dbf875f47934b25a6d3113c6a4fbec2
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to lead the user to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension, a common tactic for malware delivery or credential theft. The ML classifier and ClamAV detection further confirm its malicious nature.

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
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+to+recover+deleted+video+in+android+phone PDF link annotation
    • http://www.bandungmesin.com/file/7139518026.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139acecd7233---refupumuluwajapogor.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/sukumi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/pujinefonurajipenofiwi.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/33056894373.pdfIn PDF document text
    • http://iscelenie.info/files/file/kuwezixelolibajijesakenak.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/92632921051.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88003577574.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/25254265824.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9dfeedddd---71115862059.pdfIn PDF document text
    • https://telorgabus.com/contents/files/16396200442.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/leronapurapunoxevibanago.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/lonanesixokukagegifenom.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/topujajevewitakotepuvena.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/34439061604.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/mivifezetuzas.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/vafeparudutidejuj.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/19345236022.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xasuxifejasitopikafegez.pdfIn PDF document text
    • https://norservis.com/files/files/waselafavofa.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/lukubidokizemimoduvu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/wizipozurivilamudaratep.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kebexodijed.pdfIn PDF document text
    • https://kapefashion.com/files/files/dixalatefupezinakejosanav.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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 15356 bytes
SHA-256: 40aafbaa6f4c7b29063747af83e000a5d18c5333674b8f7f3ab3cfd2b60c38bb
font_01_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 10584 bytes
SHA-256: 74a0e6789b9b6e1f6d943112284c5c1cf211accb258c1cbeeb5a0b82ed6aa47f
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1