Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f83300b7d8a449b…

MALICIOUS

PDF

76.3 KB Created: 2021-10-06 20:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81df5b6e6e15feb0b5c24cca3922b0d5 SHA-1: 0adc60902678f7da935c8d742701760f8a73550e SHA-256: 1f83300b7d8a449b565dff3c0f1dc1374bd1d5125c8fa4f9e5c1c176f61bb40d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a high number of embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gardena.crazyrockinsushi.com/uploads/files/69812184962.pdf In PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/xowazifonagusatume.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/2579255033.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/mifafadopupamasopepomev.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vepadunow.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/11636020077.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lotepumupubavopovuj.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/431498415.pdfIn PDF document text
    • https://kimansion.com/uploads/file/wuzewemapikupeso.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/60696633758.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/72752663560.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/1930573589.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/lamifabusebubonedupuj.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/tizeso.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913101514.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/96028091832.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/2973736026.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/85140826142.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/rukudegi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161593b1bd6a67---tosubaw.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/pugarinonatisosimowaduda.pdfIn PDF document text
    • http://patroha.hu/file/nenapemevilu.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/68646473784.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149783a3a507---bunujedusil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=persona+5+royal+dlc+accessoriesPDF link annotation
    • 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://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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 10512 bytes
SHA-256: 6e625c9e9a954f828cfda46dfb2d6e157d70ca95540cf197e462465990bf4479
font_01_sfnt_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 17884 bytes
SHA-256: f7adfb18371012371dd90b11f855ce81c243717adc0bbf1196264ac8c6cd2c52
font_02_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1