Malicious PDF — malware analysis report

Static analysis result for SHA-256 caad4474c8001965…

MALICIOUS

PDF

99.0 KB Created: 2021-03-18 07:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a54df0a8650db15a0ab7136ec1a7105e SHA-1: 501779cbd730451ac640792e6924991351bd9a96 SHA-256: caad4474c8001965b33fac049842580c0edf78cede525c6d0177ec58123f4fb4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as an external URI pointing to 'dugedepap.ru'. Heuristics indicate the PDF acts as a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/123?utm_term=cakephp+3+form+submit PDF link annotation
    • http://wamuvosuvebupa.iblogger.org/94202039223.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/56820027441.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/swot_analysis_strengths_weaknesses_opportunities_threats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6414516-5cc8-4903-b3b6-af0a1f505adc/how_to_troubleshoot_submersible_pump.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/fujefizefunizufopirafo.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/clapping_music_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd13b5b-e5e9-4b9b-9bac-aeb559dd6809/g-shock_original_ga-110gb-1aer.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/7469587047.pdfIn PDF document text
    • http://verafewema.rf.gd/99308417240.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/bitumen_sheet_supplier_in_bangalore.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/big_green_egg_prices_small.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/vugusinidube.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/57222591687.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/54871389147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88be2cc1-0861-4833-a0e0-35ba6d29a154/should_you_wake_up_someone_having_a_nightmare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eabe311-913a-485c-890e-3ee977d8aca7/niwupujonegusa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/javascript_android_development.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/limekuzobesowelan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46aed74a-4095-4845-b500-6dc139b3387f/47910368288.pdfIn PDF document text
    • http://mikifovitop.rf.gd/the_economist_march_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/star_wars_shattered_empire_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/13516040446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10c70bf-0cc0-45c7-867a-a7d99e426598/52259344498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e5e35d-36fa-498a-832f-162378fa16d5/dyson_dc44_brush_not_spinning.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_off000146f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F3 5380 bytes
SHA-256: 32e7501efbc9c3bfbb9106e83178247815a8cd9a9efc27006f3808e902ba95a3
font_01_sfnt_off00015915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15915 11060 bytes
SHA-256: 7d6ceff8f639cc4cdf14ec5df1c88d98e736be5736a2cdae4a912655fdc59b53

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