Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ad7477fbc124b4…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 17:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9a603bd789cfcf51e46532dc81727c81 SHA-1: 55290b6634d7ec993a0da4faa7ddc5564bd93514 SHA-256: a2ad7477fbc124b4578668982fe9020f1b04b18dd5cd06a7fea819521d07d02b
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 0.9997

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://soxebez.ru/award?keyword=spreadsheet+application+pdf PDF link annotation
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/77690.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/2085026.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/eeda836516a56.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/g_shock_ga_100_lg.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/biological_clock_mechanism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_60502580367fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_60243cd365799.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/tuzuzokevama_papuzagazotel.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/germes_arobies_msophiles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_601dad5a6bfcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fc686ac01c9a.pdfIn PDF document text
    • http://punoxezozijus.iblogger.org/sulaliworewopidar.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/bomozevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxemibusap.epizy.com/astronomie_populaire_camille_flammarion.pdfIn PDF document text
    • http://zesinule.rf.gd/66776013212.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/case_interview_frameworks.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/7671089488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122d0efd-30bc-446c-a153-5450670e427f/dunkin_donuts_plain_bagel_carbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d74480-ab9a-49b0-a67c-573ed9b8e3ee/bokoneribisopa.pdfIn PDF document text
    • http://xatesowogexiwu.epizy.com/63064628325.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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5344 bytes
SHA-256: 4323d2b9ed8c02d206ec100fa0612f90dc382e1373872328ec589c1c6cb5cd66
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10756 bytes
SHA-256: 64093596ff9bd5108aeab91aca01331e9bea79f84200d179d021c8d20f3ebced

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