Malicious PDF — malware analysis report

Static analysis result for SHA-256 639e9a011600a36e…

MALICIOUS

PDF

67.4 KB Created: 2021-03-02 07:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9226a7f74abaff6944597767332d35df SHA-1: 143f0fb0722fe5fa5b6d1a2e1cc87c2e5e61ce76 SHA-256: 639e9a011600a36e49d601dc3b4d56d7f2d3144509962e0bc962b521c15d3b35
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to PDF files hosted on Weebly and other domains, suggesting a link farm or redirection mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be a precursor to delivering a password-protected payload. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/wix?keyword=period+question+mark+exclamation+point+worksheet
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/gudirodexukatiga.pdf
    • https://firowugulok.weebly.com/uploads/1/3/4/4/134484499/84d418bcbf.pdf
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/4d8b9073c095b.pdf
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/91bd0.pdf
    • http://denizan.com/date_function_in_report_builder5acgf.pdf
    • http://frut-tree.site/tegupopurjvw8.pdf
    • http://qrettalq.online/how_to_connect_two_pieces_of_wood_end_to_end2mxwr.pdf
    • http://trikolor.site/griffiths_quantum_mechanics_solutionwf0ba.pdf
    • https://cdn.sqhk.co/lexuxeza/bT0igjh/rotupije.pdf
    • https://cdn.sqhk.co/wegodimumod/ibihXOE/racing_xtreme_fast_rally_driver_3d_game_download.pdf
    • http://mandarin-fruit.space/59134522930v4is0.pdf
    • https://cdn.sqhk.co/wojusipi/bngdDhi/draw_joust_game_hack.pdf
    • https://cdn.sqhk.co/daxerarugak/ijgVieP/realme_c2_lock_screen_password_reset.pdf
    • http://dnepr24.info/muguwuleravukisivififo0kkmg.pdf
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/853177b239fae.pdf
    • http://busforpay.online/bafofimamazixegiso4dikg.pdf
    • http://mosquito.codes/40_hour_timesheet_calculatordf67p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc35.bin
584e3ecf7edf5e377274eee687a52b986b320d42f8b1c8ae6a7aed17dcbe13b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 5664 bytes
font_01_sfnt_off0000df65.bin
4bb6d384724209929df1a05fb9361d6fc4b4805da0cfec0c124a349c59776da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 9660 bytes

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