Malicious PDF — malware analysis report

Static analysis result for SHA-256 198c8d2be19c35b9…

MALICIOUS

PDF

78.6 KB Created: 2021-05-01 20:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ca74a456c8a7f5e4d3e1b815c38e0d4 SHA-1: af9463bf522084f0f21d936ef5f55a6462370b83 SHA-256: 198c8d2be19c35b9e50b749200eb0b240318a93f941e07d1629dfa249f581254
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. The document contains a mass of external PDF links, suggesting a link farm or phishing attempt. The primary URL, 'https://kuzutuzo.ru/strik?utm_term=sun+tracker+pontoon+boats+for+sale', is presented as a search result, likely to trick users into clicking through to a malicious site.

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://kuzutuzo.ru/strik?utm_term=sun+tracker+pontoon+boats+for+sale
    • http://lumobumekola.getenjoyment.net/jim_croce_guitar_songbook.pdf
    • https://jowudanomigi.weebly.com/uploads/1/3/1/4/131455141/dewuvisowenilobuper.pdf
    • http://dfds.in/tarevibuxoxab3dblm.pdf
    • http://trylait.club/mukudivosanaguravalosigt0ypd.pdf
    • http://outputqwvk.space/24232726845mjtzb.pdf
    • http://reduslim-eu.site/fetokufabidujalivotukedil4y67g.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/fogigaxirarosazi.pdf
    • http://joriwolujuf.sportsontheweb.net/40376568139.pdf
    • http://smallita.space/oswaal_sample_papers_for_class_10_2019_social_science8a4d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://disoluje.myartsonline.com/22377661936.pdf
    • https://s3.amazonaws.com/dikobepibelun/john_deere_x324_for_sale_australia.pdf
    • http://wikukodukoja.onlinewebshop.net/23727181511.pdf
    • https://s3.amazonaws.com/jovekus/how_to_adjust_throttle_position_sensor.pdf
    • https://s3.amazonaws.com/ladojenefe/bavudoreka.pdf
    • https://uploads.strikinglycdn.com/files/28d84b9f-b9e9-4784-8c40-09b04872bb13/22163444950.pdf
    • https://s3.amazonaws.com/batiku/best_facial_mask_sheet_for_oily_skin.pdf
    • https://uploads.strikinglycdn.com/files/4473d0c8-d4a9-4bd9-a535-0f5f552692a6/why_is_my_amazon_tablet_not_coming_on.pdf
    • https://s3.amazonaws.com/jozetej/ninujuguf.pdf
    • https://s3.amazonaws.com/risalenefazozo/kabuwekeserujudi.pdf
    • https://s3.amazonaws.com/fajetufekejo/behringer_xenyx_2442fx_manual.pdf
    • https://s3.amazonaws.com/nimuwet/pitolumotimebusov.pdf
    • https://uploads.strikinglycdn.com/files/5ddfb0c8-b543-42b9-9a7f-6f4e573f5503/dantes_inferno_canto_1-5_summary.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_off0000f669.bin
5e436c2adf6aa9395e72d97bedbb392fed6fa03abbc739fa568a023894daff60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 5316 bytes
font_01_sfnt_off0001088c.bin
62e45db3d8b6cd63bcb01b6b761c2a3c410cf6a422d81ae42c978be279caa9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10732 bytes

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