Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb46b6afca48ea…

MALICIOUS

PDF

81.8 KB Created: 2021-04-15 10:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6c89747504b67aa0841582e30ff91c56 SHA-1: f5c586d2cacf49305cd920e7ce9e91498315a11d SHA-256: d3cb46b6afca48ea22251b672de22e97b9fc80f98a0c557e11d22690c558ed8c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to audio interface reviews, likely to trick users into clicking malicious links.

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://botokaw.ru/strik?utm_term=focusrite+saffire+pro+40+audio+interface+review PDF link annotation
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/6025018.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/64588417573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_602638bfe00af.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/pexasugoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369138/normal_5fe59989623fc.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/18719688170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_605b602808afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_606e8d052b0e2.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/5426898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitiwefebulu.rf.gd/hottest_video_games_christmas_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dcdf476-b3a3-49f3-aefd-c973067a0fd8/82856532920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9892c380-8832-4f37-9179-f93ac6e2c090/89136024772.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/95621734198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc90188-e652-4c08-8d8d-6c4f82839ca6/what_is_the_current_political_climate_in_south_africa.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/motivational_interviewing_group_worksheets.pdfIn PDF document text
    • http://rifufogasuser.rf.gd/joel_mchale_show_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a8ea62-c462-47b1-a568-2aac104e2349/crochet_baby_socks_for_beginners.pdfIn PDF document text
    • http://lexalerov.rf.gd/10640752765.pdfIn PDF document text
    • http://mukexojot.rf.gd/78937061236.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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 5452 bytes
SHA-256: 3fb2b59d5110f66a62293c9a024b9666caeb5084df713c1130fff6983524f563
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 11512 bytes
SHA-256: 2cf99ccd7c9dde5b06f4a69ae1c85499342937b35551fd762f21e53edee96f6e

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