Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4973261f0d2242…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 21:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1399409450b224b99e86a6ecac750293 SHA-1: 5eb58c184f99af8b70b83c2b686a5ef494d506aa SHA-256: 4c4973261f0d2242018f4947797b61909363ef537928e99731dee66f7e1f4e51
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a URL that is also listed in the extracted URLs, suggesting it's a primary lure. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://xezojetit.ru/strik?utm_term=why+is+my+fluval+filter+not+working PDF link annotation
    • https://cdn.sqhk.co/tipesewete/iaXhfgi/jesadesigojesorovofitij.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/geL4igj/forgiveness_a_conflict_resolution_strategy_in_the_workplace.pdfIn PDF document text
    • https://cdn.sqhk.co/vebapejun/diajcfQ/lock_screen_wallpaper_for_iphone_8.pdfIn PDF document text
    • http://chelobaka.space/ve_mahi_kesari_mp3_song_downloadxbjef.pdfIn PDF document text
    • http://premial.su/52297569909pozsa.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/agBjcow/ampeak_smart_charger_user_manual.pdfIn PDF document text
    • http://biomaniks.website/remuriwariforekama2h6vi.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/cjgx2gf/sojakajolazefexuta.pdfIn PDF document text
    • http://dukozodi.iblogger.org/polystyrene_insulation_sheets_bunnings.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/nAhePdp/45514531618.pdfIn PDF document text
    • http://arm-watch3.club/812588721792uike.pdfIn PDF document text
    • https://cdn.sqhk.co/vubenexew/jflijYm/78215496685.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/jh4jd7J/this_means_war_lyrics_petra.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/cjdhhmK/why_learn_business_management.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/aheihgi/2567376769.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/jiicV41/98962299310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c775ac90-65a4-4451-9dbb-fb224bd27264/manual_de_organizacion_y_funciones_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d28fbc7-57f8-48eb-b315-cba0984dd644/24311403631.pdfIn PDF document text
    • http://mowiwanafiv.epizy.com/11064984405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491b7d12-faab-42c5-8758-0cd45c9517e9/where_is_the_starter_relay_located_on_a_2008_ford_focus.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/fuxufipegikuvarelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8deec48b-85bd-4b0c-aea0-0740d5b83b56/waxetinux.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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5512 bytes
SHA-256: 2fa83cd298b7d2c2c61fd9b2cedae568c38c757a8d580570001c62f6bf4c0cfb
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10092 bytes
SHA-256: a330a7afa9632d117ca4f6e7158dee261dff2c1487de4e6071c59175de8b270f

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