Malicious PDF — malware analysis report

Static analysis result for SHA-256 51006eca4296be5e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e04302a23acc35a28bd42d23489ced3 SHA-1: 642a10f7e61d32f93c31cf61e5f20d8a55b4b2d2 SHA-256: 51006eca4296be5e2eb3ffe0f826e60526bff5b1e493c0c82ce99c2e97e66a28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://asiadomainstore.com/userfiles/file/94011679577.pdf In PDF document text
    • https://makenie.com/upload/files/15829705161.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/32430018877.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/87500132018.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/13700311921.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/vonipu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/68828836292.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/80715452807.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/37772621663.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613328d13bf67---14358501682.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/25591373790.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/mifafix.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/12063204628.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/pofoxugemiwusororomopu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcde7f1018---653887206.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/10285442234.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/jevunoj.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bikaronevozijowejekomini.pdfIn PDF document text
    • http://sjanzee.nl/file/dapogigebegu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/40386890939.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/likarijopubogajapet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ssid+number+on+my+phonePDF 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_off0000bb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 16384 bytes
SHA-256: fc7feb58fb199644db53364a8b5518734e6c4f9dbd051fe02d6928ee8ed51e8f
font_01_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 10780 bytes
SHA-256: 3190fa4d3c26d480d518066f84d78bb9d84b75f1cee8d8fd949da9a10b28c790
font_02_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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