Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd07da22ad6e629f…

MALICIOUS

PDF

83.8 KB Created: 2021-03-21 22:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c663d87c0857288cebba5ebeb7c096a8 SHA-1: e32928700f2c0e438a74925aa82d919b21700821 SHA-256: dd07da22ad6e629f731efec4506c5069ff5e8d7269fd943c995ce476aa338efe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+does+coso+define+risk PDF link annotation
    • http://xekumaluvox.iblogger.org/garonaxesiposibukefofuze.pdfIn PDF document text
    • http://pusosokus.iblogger.org/pofedesiw.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/miles_boykin_scouting_report.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/879dc1c0-7fe8-45e6-80f0-b6af8588153d/motorola_2_way_radios_50_mile_range.pdfIn PDF document text
    • http://gunimatol.epizy.com/17136414372.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/5025627410.pdfIn PDF document text
    • http://garapaf.epizy.com/62687719779.pdfIn PDF document text
    • http://xivuzadozazul.epizy.com/algorithmic_and_high_frequency_trading_mathematics_finance_and_risk.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_eeddce8b9c304ecb8e837b02f58c3e5a.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_ce58dc1696aa49519a2e4fcb8dcc03b5.pdf?index=trueIn PDF document text
    • http://tapalif.epizy.com/zizemuzusesetukevufojajon.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_5c56711edc5a411b973c7e74d4339650.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/marvel_future_fight_5._3._0_apk.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_eb173bd3b93442b5b5cffc5ac0cf3618.pdf?index=trueIn PDF document text
    • http://xebowuruno.epizy.com/applications_of_nanotechnology_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098f81db-55af-46b7-a744-2e3d7214a622/list_of_conjunctions_in_english_and_spanish.pdfIn PDF document text
    • http://pubexet.rf.gd/lg_top_load_washer_detergent_dispenser_not_draining.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_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 4888 bytes
SHA-256: a96464a45fe5fbbd4815b018068bf64f4ec514746e9bf7a29e648421eee22ba7
font_01_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 10420 bytes
SHA-256: 374a2f7519827e77980674cf0597bc3b79aef73a35debfc481387d513fa35eed

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