Malicious PDF — malware analysis report

Static analysis result for SHA-256 af613c81c5b46ee7…

MALICIOUS

PDF

78.4 KB Created: 2021-05-12 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8124d5b8c54dd6a50fe5e4c53f59f942 SHA-1: 574c5e7dcae5d159dfd75e8f289b79f45c12de3a SHA-256: af613c81c5b46ee739f4667bcbd3e558b4b3f82f20a9f62d76db5003696f04f0
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 0.9992

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/strik?utm_term=how+to+write+a+chapter+summary+for+a+book+proposal PDF link annotation
    • http://yandex-dostav.ru/nikon_p510_camerabh5uh.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/32654579731.pdfIn PDF document text
    • http://mx50off.pro/2003_jeep_liberty_oil_filter_typet2omb.pdfIn PDF document text
    • http://tophomework.space/vozamasztelq.pdfIn PDF document text
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/2223758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5fee6324b8368.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/capitales_del_mundo_por_continentes.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/vazurebepukoduwanadevuxov.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/jejufo.pdfIn PDF document text
    • http://xuxodowenam.getenjoyment.net/join_files_app.pdfIn PDF document text
    • http://naturalik.fun/how_to_replace_drum_cartridge_xerox_3215zf110.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/gadusola.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/tulomuxuzuru.pdfIn PDF document text
    • http://rodsfish.club/sydney_secondary_college_blackwattle_bay_campus_uniformeymdj.pdfIn PDF document text
    • http://ledimpress.biz/bundesliga_league_table_and_form1tw5g.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/breAHih/73005597852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_605cada0b53e3.pdfIn PDF document text
    • http://fitness1.space/illinois_dcfs_cants_5_formsexvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_5fd863a2b1685.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/eN9jeji/punetorimogadu.pdfIn PDF document text
    • http://interstart.online/does_bounce_dryer_sheets_repel_mice9oqu1.pdfIn PDF document text
    • https://lixibagiz.weebly.com/uploads/1/3/5/3/135348296/93b0fec8.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/LJvhfWE/best_guide_book_for_switzerland.pdfIn PDF document text
    • http://hellochildren.online/joxoduwajojinebadodikzz1r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilumepidiwego.myartsonline.com/bose_sounddock_series_ii_portable_digital_music_system.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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5612 bytes
SHA-256: 6d9d0779ae328f347792eb86a9ef30f141668294991cb616c20bde576e63787d
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 10712 bytes
SHA-256: 698308c86de84aa28f8d2c55d1e0a5f1d28fd579271f568472f21787df543784

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