Malicious PDF — malware analysis report

Static analysis result for SHA-256 66928434571cedcb…

MALICIOUS

PDF

87.7 KB Created: 2021-03-01 18:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f392b1f832b4a32ffd26cf9d144501e SHA-1: 0863faadcc59da9455cf8ee7a895a30de37e6a42 SHA-256: 66928434571cedcbf66822e9f92f3266fe4f5ad428d038cface4f496ffa7a784
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily corrupted, contains fragments related to 'Speed queen washing machine key' and 'wkhtmltopdf', which likely serve as lures to direct users to the malicious URLs.

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://kuzutuzo.ru/strik?utm_term=speed+queen+washing+machine+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427501/normal_5fc84fb344a9f.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/gerujojed.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/bhdnIjj/ac_dc_greatest_hits_2_cd_set.pdfIn PDF document text
    • http://chuvashovfamily.ru/86128377227l86ob.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/hcFeQb6/mx_player_app_download_free_old_version.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/fd6be1db81fc52a.pdfIn PDF document text
    • http://lnstagrambusiness.com/cheekh_drama_ost_audio9cwi2.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/8c94f.pdfIn PDF document text
    • http://baranaydin.org/59511656584bfqk6.pdfIn PDF document text
    • http://fabermanufacture.ru/76410427198wkj5q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379842/normal_60018f665ff32.pdfIn PDF document text
    • https://cdn.sqhk.co/fibapezo/Uijcq4w/me_pongo_asi_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_602b9c3298efb.pdfIn PDF document text
    • http://timogefubor.22web.org/jaravazabovanegowa.pdfIn PDF document text
    • http://kdghy.online/saxifasomowegiwuxaxiwilokm4x9p.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/december_2018_calendar_excel_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tutedenomazul.epizy.com/how_to_install_honeywell_smart_wifi_thermostat.pdfIn PDF document text
    • http://toduwez.epizy.com/jabawibofidoxeloro.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 5848 bytes
SHA-256: acbe7421a108f4d7a9aebd1ac6bc14024167da66cd8825b70788aaf074929f9b
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 10764 bytes
SHA-256: 093264cd2e909d1855ef52c2318e65f3d11a88ff86d9c8c7431e2f4125e4bdff
font_02_sfnt_off00013bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24

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