Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cf39ea2ab475c7…

MALICIOUS

PDF

92.5 KB Created: 2021-04-14 06:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c18aefba6c357527a5c5b8073e9436b SHA-1: a6e3cd942a1e034c7b77908cbc8851462d62a547 SHA-256: 51cf39ea2ab475c796d79e83731c0f4dbefeba82502b24966b8da7da8a0e1d15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external links suggest an attempt to redirect users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=divinity+original+sin+2+walkthrough+gamefaqs
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/gomudipijupidijadome.pdf
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/1821333.pdf
    • http://rakivabe.sportsontheweb.net/cholesterol_free_diet_plan.pdf
    • http://tezijexipilimo.getenjoyment.net/adeptus_mechanicus_codex_8th_edition_vk.pdf
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/tozafapegi.pdf
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/4777112.pdf
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/nibofinit-lopap-nijimovewato-pulibufonine.pdf
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/gogidogomelovero.pdf
    • http://pozijuza.scienceontheweb.net/lijesu.pdf
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/fudatelifaw_sasadutul_wujumirifasuve_xorapakikotudud.pdf
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/e2af4c2e5.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/ximabesoxuj_womosokofuno_nojari.pdf
    • https://boforotove.weebly.com/uploads/1/3/5/3/135393238/4701351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nedizilunok.myartsonline.com/artemis_fowl_the_arctic_incident_free.pdf
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_8b6c753800a147aeb6bf90d318a027b0.pdf?index=true
    • http://zuputes.atwebpages.com/how_to_install_fleck_5600_water_softener.pdf
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_160e551044a54a5180758dde164c250d.pdf?index=true
    • http://niwurekatexo.atwebpages.com/pdf_editor_add_pages.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127db.bin
c6f72bd5a4f700cd940fae469886091721fdbe0d41bad960c7f851c46455c05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 5756 bytes
font_01_sfnt_off00013b71.bin
86696f021283dbfda9dca5818de1ab61f7f07f327badacd3b4bb6eee4a2d440b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 12220 bytes

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