Malicious PDF — malware analysis report

Static analysis result for SHA-256 94745820fbeaa5b0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 15:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228c1cfcb1590bc866ad47d5195a6af6 SHA-1: 787e4809ffb06591973fed1b62ba4c6057c1cffa SHA-256: 94745820fbeaa5b085a0f7e4667bf2a16ce5b6b0a818928b0e1ba2ee130b216b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, pointing to various websites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=sony+str+dn850+firmware+update
    • http://gekodejevotug.medianewsonline.com/where_is_the_heating_element_in_a_speed_queen_dryer.pdf
    • http://basumoxivor.sportsontheweb.net/muxagiti.pdf
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60175c423711e.pdf
    • http://lezobul.medianewsonline.com/cracked_minecraft_windows_10_edition_by_team_extreme.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_604f7c83585c6.pdf
    • https://cdn-cms.f-static.net/uploads/4451363/normal_600f07041e5f5.pdf
    • http://lokubakodo.getenjoyment.net/structured_cabling_system.pdf
    • https://fovenuratosoka.weebly.com/uploads/1/3/4/5/134582487/nupegalufen.pdf
    • http://xitodefigatefuj.medianewsonline.com/thermo_scientific_lindberg_blue_m_water_bath.pdf
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/luzakudebegipatewe.pdf
    • https://cdn-cms.f-static.net/uploads/4448137/normal_60439796879d5.pdf
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/003b6.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_60317773ea51b.pdf
    • http://kopuvimu.scienceontheweb.net/nodole.pdf
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/896a53f27ddd89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db0cb94e-aef3-4dcd-ae64-44389cd1da91/41609282224.pdf
    • http://pasifowon.atwebpages.com/83705647319.pdf
    • https://uploads.strikinglycdn.com/files/a3472eb8-14d4-4405-894e-2d0971462b3b/kusuribifekinew.pdf
    • http://fixiwajavonuti.atwebpages.com/58967639753.pdf
    • https://uploads.strikinglycdn.com/files/9be1ba4d-313d-4434-be77-cacd9383714f/when_did_christianity_began_to_spread.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_off0000ead5.bin
d5b4f2e865627fde9e207597f2370934154f30060695daee3f2c56aeb883450f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5912 bytes
font_01_sfnt_off0000fefb.bin
26f247e0e8a29ffd05964ace4e4df926558d9ac725493fb11e0d3f2c71c13d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 11672 bytes

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