Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9537ea28cb39743…

MALICIOUS

PDF

72.1 KB Created: 2021-06-03 08:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fab730f61bbe1b528a50a209598a71b SHA-1: 788cdbb796e32ac82657fc181271ab7155a2e234 SHA-256: d9537ea28cb39743576c0cc43f50bcba2c8e72e2ad3ea0078c56978a5569b5d7
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8129

Heuristics 5

  • 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-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
  • 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://philabc.ru/pbw?utm_term=how+do+i+turn+off+razer+gaming+mode
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/37d0bb11cf3.pdf
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/betakowiligamumi.pdf
    • https://ziripovamenof.weebly.com/uploads/1/3/4/6/134647136/13ba03c.pdf
    • https://besumexuzeju.weebly.com/uploads/1/3/4/6/134646316/71ef6.pdf
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/6415359.pdf
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/51af99200dc410.pdf
    • https://xazunavawotop.weebly.com/uploads/1/3/4/7/134724639/3621242.pdf
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/e5af0e7e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dajodovilav.pbworks.com/w/file/fetch/144534255/57096783900.pdf
    • http://dadilotofexi.pbworks.com/w/file/fetch/144514584/32589184380.pdf
    • http://vugufosenene.pbworks.com/f/ali_kundilli_2_full_izle_jet_film.pdf
    • https://uploads.strikinglycdn.com/files/bc0287bb-b66e-4778-a460-322e75c0a255/91997308451.pdf
    • http://godekazonigi.pbworks.com/f/50304372295.pdf
    • http://jevibufile.pbworks.com/f/what_is_the_difference_between_formative_and_summative_assessment_give_examples_of_each.pdf
    • http://zeratuwolima.pbworks.com/f/download_harvest_moon_fomt_bahasa_indonesia_gba.pdf
    • http://bupataved.pbworks.com/w/file/fetch/144420834/writing_algebraic_expressions_from_word_problems_worksheets_6th_grade.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144537432/how_to_play_baritone_saxophone.pdf
    • http://numefen.pbworks.com/w/file/fetch/144534432/61713943987.pdf
    • http://fulusivijomu.pbworks.com/f/libro_calculo_una_variable_thomas_13_edicion.pdf
    • https://uploads.strikinglycdn.com/files/bd65616a-e62f-4fce-a6e2-f7038bfdf6b4/how_many_hurdles_in_womens_100m.pdf
    • http://natutaliva.pbworks.com/w/file/fetch/144538497/how_to_win_gardenscapes_level_65.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f586.bin
679b982e945210fd5cc1925622d683ab1eb3bedc774950a7cca7dc45f952a2d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 5120 bytes

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