Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cccdce4bef1bed7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 07:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ae22ff8dc4a1ac4d1129963db2aff96 SHA-1: c8622172f641388bbee30eca6838c17cf0236b41 SHA-256: 6cccdce4bef1bed724a1ec40139482e8a17c70045ca87a2eb9ee0052ff99baf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirector mechanism. The PDF's structure and embedded content are consistent with attempts to disguise malicious intent, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/36888144460.pdf In PDF document text
    • http://decorstore.eu/upload/file/xizoxokuzekekozidazor.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wutodilikuvojekami.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wovewugapajuwusawawi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613053fe96d6f---75279812631.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44434419197.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/91458324902.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/73991197667.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/topulejolevufito.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kijubuxin.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/rigubozi.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/telufazeri.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/32175583532.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/porufitadozugi.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/85145992893.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/bexixi.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodilir.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/4190112999.pdfIn PDF document text
    • http://kechengchem.com/upload/files/gijejolemuwowek.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/voforujazilatedexotosuwif.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/84639965540.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3148a402d5b02011ecb7d868df8911ee/fubuguturosip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+draw+a+triangular+prismPDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10780 bytes
SHA-256: 8fc6116b481dc2be24ff7d09783a1749f979e26ae649ce19f62b490ca041aacf
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 19060 bytes
SHA-256: 719f9c994377d5ad37a78600d0eb25291babfc7e1bc9e50f5d4d84894bef27c3
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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