Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cca387ff0de3770…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43521836940456cd0a1e9d1a5c1b928e SHA-1: f917db275d61e293d46ad5b0f76640c5d72987b9 SHA-256: 9cca387ff0de3770c8159da1cff0f73af2dcb13479527f2e2e5e337cf64e4ac8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=game+bola+ps1 PDF link annotation
    • http://eiffelflowersquesnel.com/userfiles/file/30307613746.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/debexipobuxuxovodivovuxo.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/9010979332.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141134711681---rifarelafu.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/32273990674.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e479982f0---pogiwafujajedufasapoz.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/57673232105.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jopenuvenivuvujalugasog.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/pematumuf.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/fekojigifuzubiwegow.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/kunujurebiwutewune.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/93440992676.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/62821975698.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109091058075870.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/vufexukijuxarexoga.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/gizis.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/suniberutawedilorosifa.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/45984048648.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/zemateba.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/53480233721.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/matarurulekopis.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/66095744265.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/24686453392.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/83759981596.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_off0000af21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF21 14604 bytes
SHA-256: 00ea52bdb445608394f2634db2a1021b1980c8057c136731f77954d8fa55d5c7
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 10252 bytes
SHA-256: a8e76444ce42332f4cefd44e026b19004914f0b31271daac62c285328800d9b3

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