Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb7a702746931b4…

MALICIOUS

PDF

81.6 KB Created: 2021-03-12 09:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc286b1d813d7542705c1f7e12977afc SHA-1: df07cd3b528fdd62274a1da708c0dce532342ac2 SHA-256: 9fb7a702746931b4c93d3cfddbf1e969dcbaa6ef66bd01a12e23fecc053bbe81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://baarspo.ru/123?utm_term=xml+canonical+form+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386851/normal_6034d059da370.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/agt7QZ8/nba_2k_mobile_basketball_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_602db2e79d327.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/Mijjggh/minetest_server_enable_mods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff6568096842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5ffcf8784ef77.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/ficjgid/78272309486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6022b5ccc030a.pdfIn PDF document text
    • http://lofeboxirav.iblogger.org/ninja_professional_blender_nj600_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/Ljihf5N/csr_racing_2_walkthrough.pdfIn PDF document text
    • http://vivebax.iblogger.org/free_spanish_color_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobixejavol.rf.gd/wakuguvagebo.pdfIn PDF document text
    • http://jibejobumo.rf.gd/witcher_2_release_date.pdfIn PDF document text
    • http://tozibuxadotoba.epizy.com/war_of_the_worlds_2005_streaming_vf.pdfIn PDF document text
    • http://vafipisepofowo.epizy.com/samsung_rf4267hars_freezer_problems.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_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 5028 bytes
SHA-256: e873d27ab3c7036037132647a7c4dd7592dd03c9f7e26712248cdd4ed0fb9c86
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 12788 bytes
SHA-256: 1848b1d121d14d5d452bd274e61ed1cd16313cd3694fda067ea3e21758e4a0fa

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