Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce48e0a457e89756…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 01:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3a60af0f8bd8bd13e737566763ea3ce SHA-1: d8a3996aa72751285bd6334566846b221a4dce8b SHA-256: ce48e0a457e897561209b9d784b08d305da1cfc68dcba1e4cbe751bc71f2cb61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using many links on low-reputation domains to obscure the ultimate destination, likely a payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=download+word+to+chromebook PDF link annotation
    • http://cctsw.net/whly/up_files/FCK/file/20210905_005210_123.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/39856314216.pdfIn PDF document text
    • https://x-software.cz/data/file/botelasasukanonenu.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/papudijebiwovejezuwive.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/2723840288.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/gutixasirubobumixen.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/73733450678.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/51957792603.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/94682600828.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/21587156513.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/97229949398.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210920003212.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/muginep.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161408ac7ad31e---jasusonixowaput.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210905040259.pdfIn PDF document text
    • http://korytnica.net/data/files/14769837067.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kevogaguke.pdfIn PDF document text
    • http://halmar.info/userfiles/file/44238537198.pdfIn PDF document text
    • http://esangsok.com/upfile/files/gasirusisa.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161429b255bb0a---56564370905.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/5650438092.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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10692 bytes
SHA-256: 74df591c79d236879c8bdb3693613dd5f651bd5be6afb1c54c7b4fa5b45c3ffe
font_02_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 18320 bytes
SHA-256: 9e3f9e508ff37448dbcb69dc4e64989ab974f25403a8bf55bfa5e63df9898039

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