Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cf3bba2af20f82…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 22:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5573f101c683088b93643e0552da9f7d SHA-1: 8bb18bf0a2f11151eb96bb44d211cb0896549ce4 SHA-256: 42cf3bba2af20f82aae0cf59a59686551e1ac3aac4f887ab09a534f00b715818
126 Risk Score

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://druttle.ru/wix?keyword=celebrity+in+death+jd+robb+pdf PDF link annotation
    • https://cdn.sqhk.co/lojewewure/Rjiz9hc/bitcoin_testnet_address_format.pdfIn PDF document text
    • http://xixubitawub.iblogger.org/finding_slope_from_two_points_worksheet_kuta.pdfIn PDF document text
    • http://betflixguvenilirmi.com/4884005881ffr6a.pdfIn PDF document text
    • http://rarojujelalonu.iblogger.org/bernardo_stamateas_libros_pasiones_toxicas.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/ginafadarubu_gexununo_goxiv.pdfIn PDF document text
    • http://nuturejedekaw.22web.org/masodukowetowajug.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/5792c9e2deb.pdfIn PDF document text
    • http://prod-fruit.space/hiwin_linear_guide_cataloguef10fh.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/zinan.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/Vgin4jg/drift_mania_street_outlaws.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaku/ckjhgjQ/21872218952.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/tuzipo.pdfIn PDF document text
    • http://portkamesto.site/46182149081nk7nq.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/YxhgjiC/32625111133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/80020754186.pdfIn PDF document text
    • http://mevexunimapo.epizy.com/lokuvebudorekebovore.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/que_significa_soberbia_de_la_biblia.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/debt_snowball_spreadsheet_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/51014848852.pdfIn PDF document text
    • http://jumirasex.epizy.com/36213894005.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/dash_cam_reviews_consumer_reports.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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5172 bytes
SHA-256: 5826274f1a3362591e2795aa8eb4707f5caad1f8c2e6c3dbf3bf521e7dc89045
font_01_sfnt_off0000feba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBA 11172 bytes
SHA-256: 670fc242362866a471635fb315be82bc0a4aef84e11a7f49ee11408fbbdb04d5

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