Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abf8cc190b87a5c…

MALICIOUS

PDF

95.9 KB Created: 2021-03-10 21:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bce96202585e387e8f87a715f86f6a3c SHA-1: 4c0566499d08823307dc0bfb9f59cd1862c855a7 SHA-256: 4abf8cc190b87a5cd1090a3df7c492618b686123686193d1d00f52c56b14319b
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a malicious document, specifically using an image lure that links to an SEO redirector. The embedded URL, https://seumenha.ru/123?utm_term=ruta+sepetys+between+shades+of+gray+pdf, is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, suggesting it exploits PDF vulnerabilities or embeds malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/123?utm_term=ruta+sepetys+between+shades+of+gray+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374532/normal_6004a1a800a1c.pdfIn PDF document text
    • http://fowunajokofow.iblogger.org/kepilulunexafito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fc5e95b80bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5ff13d87d9da8.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/seporefapabazefon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fe2f75bd378e.pdfIn PDF document text
    • http://barekokodigak.iblogger.org/windows_10_setup_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_60069fa5bbc03.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/types_of_electrical_materials_needed_for_house_wiring.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fdd49cd44cac.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/what_are_the_major_parts_of_natural_selection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60133ef810f67.pdfIn PDF document text
    • http://nipuxikupiluzep.iblogger.org/boxekoleremafirawup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_5fdc4afbce322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulawogini.rf.gd/caperusita_roja_en_ingles.pdfIn PDF document text
    • http://luvoximod.epizy.com/xoluronukuxilavoligi.pdfIn PDF document text
    • http://midelex.epizy.com/1113_jazzy_electric_wheelchair_battery.pdfIn PDF document text
    • http://pixafur.atwebpages.com/online_student_attendance_management_system.pdfIn PDF document text
    • http://rusireges.epizy.com/aws_glue_cost_and_usage_report.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/irregular_verbs_exercise_1_answers.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001489b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1489B 24636 bytes
SHA-256: e438aa9e6b1de9117bba1cfcf55856fc18e512f777cff7837d5364cce9441246
font_00_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 5612 bytes
SHA-256: 115fefc1dbdf46a4286ebb446bbdba14e5a1c1a8c2491b24943af597b1d201f2
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 12708 bytes
SHA-256: 12b6db84c595b1385a45eb8167cb4c960288f1efcb961d933b567cf575e08387