Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f38bda1514f7848…

MALICIOUS

PDF

68.8 KB Created: 2021-03-14 16:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4cf46c7bcda4f2dacd3ba81b93677c55 SHA-1: 5d95e3455d6b4d46c7a049d41fcb26e0692834a7 SHA-256: 9f38bda1514f784890766c12a7c13d6f92df5bfaf3b95292e2acffe5303234f7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to disposable domains, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/wix?keyword=williams+heater+manual PDF link annotation
    • https://cdn.sqhk.co/jufebarur/bjd0gfP/xewewonunifibexomuxu.pdfIn PDF document text
    • http://pressit.space/globus_tours_reviews_irelandyugki.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/gXaXUFq/rocket_royale_hack_apk.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/68f899ffda3050b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6014e3d40e025.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fe4a622826b8.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/dJMzfZc/xukadekejenumirejukif.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/4705731.pdfIn PDF document text
    • http://nonretloli.site/hillsborough_county_schools_calendar_2019_to_2020zqutr.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/himNnD4/repariwawako.pdfIn PDF document text
    • http://kpovli.ru/xujenigujazaba2i3rm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_602770dd70f49.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/kuluzanofaxipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_5fe33d390f728.pdfIn PDF document text
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/9635379.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/cc860d4141257cf.pdfIn PDF document text
    • http://milanomodaitaly.site/d2x_cios_installation_guideeze88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fcf1aaf4c3da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbe9625-87f7-46bc-8c44-06cf840da694/desktop_internet_shortcut_not_working_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad9adfc-4eac-4e67-a56b-aaf64ce97337/how_to_set_up_a_volunteer_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b594245d-f35a-47ad-afa0-26ee883de27b/what_happens_to_luna_in_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc1230e-fd9f-4728-8944-5e05c3fb0d05/where_are_the_military_bases_in_germany.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_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 4940 bytes
SHA-256: 2744d91fe244bd7c745714fd4e7b82ac20643f025a8eb220fa3183baa7ee168c
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 9524 bytes
SHA-256: daa074ab446f399073dff16c348f42141624319759a63df3325bcf9817f46e0b

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