Malicious PDF — malware analysis report

Static analysis result for SHA-256 552f9c7506110ce2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 03:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce1150761c0d0a6f5fe1cd707d3a8356 SHA-1: 2949e782752a3c65b28b278dba195f79582709e2 SHA-256: 552f9c7506110ce27d3295e9faa9fdc1fb68f44a4de509835e6562d99c374b43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it's designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports its role as a malicious document, likely used in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=impact+client+minecraft PDF link annotation
    • http://www.primariasantana.ro/uploads/file/lanedor.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/19690838217.pdfIn PDF document text
    • http://medi-sen.com/files/files/buvemikegorenumirikole.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43470901874.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/bivinavu.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/30858825121.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/44230212970.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/54396112484.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1584675799.pdfIn PDF document text
    • https://inarsindbari.org/uploads/64115043277.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/dibat.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/62587113407.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///vebofasowufarogaxigobivuw.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/33665294018.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zumokanovurujurozezigupif.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce5eba893---fonedewejad.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/wugujozos.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kotupimolekijuwodigu.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/78973643773.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jatudipadixudilotogasof.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/53453195760.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/sipujo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45816814499.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/garodafasadit.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/17333390556.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://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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 18072 bytes
SHA-256: 8ffe6af71c426d832d3acb087d58b23e70c641fa384d8f30f24758bafd730cb5
font_01_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 10304 bytes
SHA-256: 1c84aafe9c5f50e4707ba050c6979dda767bef0678cffeb9f39402ac313c6c58

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