Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e91c5f088094b2f…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 11:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6c1c2e50f9270f6167b7c8744095447a SHA-1: f3ce1c78e4d161e2746a1cb554a17062c716a61c SHA-256: 2e91c5f088094b2f33d6e922ed1cb4d148ca2c20261165a0f99fac93bacf2707
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=msc+in+wildlife+conservation+in+india PDF link annotation
    • http://copyrightnotices-form.com/army_commendation_certificate_templatee5tld.pdfIn PDF document text
    • http://ttop-shop.com/powopanasurusuvonazppabg.pdfIn PDF document text
    • http://apparentlyopt.com/kikuyu_bible_appx1z5e.pdfIn PDF document text
    • http://gnoogle.site/58797581200g4gvr.pdfIn PDF document text
    • http://blaugrana.ru/minecraft_earth_softonichwgcb.pdfIn PDF document text
    • http://lozhobelir.space/extreme_car_sports_racing_driving_simulator_3d_downloadwriia.pdfIn PDF document text
    • http://se-mrush.com/donation_request_template_freef9c7z.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/810bc18e5e.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/xesenunepujovide.pdfIn PDF document text
    • http://vorecan.space/99386058128cqh32.pdfIn PDF document text
    • http://tk-pobeda.site/31122199369tfk8k.pdfIn PDF document text
    • http://hydrofthol.space/95802558119541r9.pdfIn PDF document text
    • http://copyrightreports.com/1433655419wv9vh.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/drXhVgf/62130746511.pdfIn PDF document text
    • http://gufutaca3.xyz/sony_str_ks4709je98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/30107490661.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/42673554661.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/arnold_chiari_malformation_type_2_radiology.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5172 bytes
SHA-256: 8aacb3f252f060a538f480912d5f552fe5afcc1270eb89f9cdcc8cecc0477e76
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10392 bytes
SHA-256: b80df6e3bafbefa70afa5c9f92901e3a67da56799f70db4d28c8bbfa9940d4a7

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