Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccadcdfc376ff86c…

MALICIOUS

PDF

72.7 KB Created: 2021-03-12 10:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b98f656d88368bcf6e9a615d6a22a902 SHA-1: 061e5fe23877d3b45dfdc25e3d21e15bf8d45a43 SHA-256: ccadcdfc376ff86c6fbe7528222634cfc7bd211f74623ceff0db104f88d6bd6e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though heavily obfuscated, suggests a lure related to 'Phases of the moon oreo activity sheet'. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

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://mezovuduw.ru/123?utm_term=phases+of+the+moon+oreo+activity+sheet PDF link annotation
    • http://ruxovesubilesuk.22web.org/iso_18001_audit_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/jDtmjbq/white_light_up_keyboard_wireless.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/timaxije.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/jehaCgc/96988112217.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/i2iajj0/1539341437.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/wunomek.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/xNhcjbv/professional_photo_editor_app_ios.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/xukaveb-zopafoxebegij-limomujegara-levulovexoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibimosozo.rf.gd/poe_betrayal_sheet.pdfIn PDF document text
    • http://sulumasofip.epizy.com/friendship_status_videos_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wemawesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c026bd68-a231-4893-b876-45406fead13e/sawolupikugatuborabob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22aa447-fac8-4ce7-8f9b-c9a52cf87c4e/gixuxabep.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/specification_sheet_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26362fd-fb7c-4a89-bd91-2992dfccaf67/dorev.pdfIn PDF document text
    • http://nalasorujuwasop.rf.gd/3_phase_power_supply_at_home.pdfIn PDF document text
    • http://xonowazibekaz.epizy.com/proposal_penelitian_akuntansi_sektor_publik.pdfIn PDF document text
    • http://fidajakafitota.epizy.com/iso_iec_27001_standard_clause_4.3.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 5252 bytes
SHA-256: 7bc956a8f3f09af2b7a2dcd9ed185c28fe8a6bb1892b395f0953ce43b1b9e04b
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 10028 bytes
SHA-256: 984f458a2f55e329fbf02898d2298f01d36707263acd288adc81bb47b85a8535

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