Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c41f924cf81eafd…

MALICIOUS

PDF

80.6 KB Created: 2021-03-25 10:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3be77ad934bec86709d993416a661a4 SHA-1: 16aca34a6eff745b898cf1b7f22ba492e6991863 SHA-256: 2c41f924cf81eafd1846ab30ca291ec58eb4161e394247c0b0eee7204c2bd650
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 0.9990

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://baarspo.ru/strik?utm_term=what+is+meant+by+text-to-text+connections+in+reading PDF link annotation
    • http://1offpark.xyz/tomtom_go_5000eyb1b.pdfIn PDF document text
    • http://helplnstagramoffice.com/239413806073b37w.pdfIn PDF document text
    • http://artdebug.site/shadow_priest_bis_spreadsheet_vanilla57d0r.pdfIn PDF document text
    • http://shlifovka-pol.website/geometry_finding_missing_angles_worksheet_answers63d98.pdfIn PDF document text
    • http://lafovug.iblogger.org/hsslive_answer_key_2019_march.pdfIn PDF document text
    • http://genoray.pro/juletus68x41.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/55614909137.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_600341c7ee90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_600c3b821987d.pdfIn PDF document text
    • http://santaparker.store/roku_xd_27e1b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5ffc560f3ad6b.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/vIlCOid/dowozaxiwegotirumalew.pdfIn PDF document text
    • http://soxexuv.iblogger.org/trane_xl90_error_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5fdee39eb1f3f.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/raxokinir.pdfIn PDF document text
    • http://remontvorot24.com/regression_modeling_strategies_harrelldy8ru.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/wiajc90/all_just_drift_away_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_601fcbc0d4e38.pdfIn PDF document text
    • http://urott-hu.com/speed_queen_washer_error_code_ed23xdp4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://norenuwidubeg.rf.gd/49723960480.pdfIn PDF document text
    • http://jexalajepufuxin.rf.gd/adobe_acrobat_pro_dc_freezes_when_opening.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/cambridge_english_empower_a2_elementary_student_s_book.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/best_ebook_reader_for_android.pdfIn PDF document text
    • http://nuvijexuwafado.rf.gd/69862797488.pdfIn PDF document text
    • http://www.readwritethink.org/professional-development/strategy-guides/making-connections-30659.htmIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 5464 bytes
SHA-256: 11ae95aae6a18c45c29ce29c26e970176a066516acc0dc1b4d2666e5f7c6b350
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10636 bytes
SHA-256: 9578045c1c582474d6b37f89c793e779289f5444619f3d50571b79ba4947798a
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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