Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dff8a438b05bc80…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e8f1a4fe4f0c22b14ec778a0f57afdf SHA-1: 4e11ebd8d977ae8391c8476f4c1cf033469c5d85 SHA-256: 8dff8a438b05bc80bc00535ab2f392e27999b5eee2fb1f41356f51ea186c102d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scamming operation, where users are directed to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://petpetmates.com/files/editor/file/96924256774.pdf In PDF document text
    • https://familienbilstrup.dk/userfiles/file/duxizilajifomujirezolujo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xoxasuvarewiliwox.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/87284581268.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/2598195064.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351fea670d6---tatinefejiv.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zumoninepitajojapemuso.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/xakero.pdfIn PDF document text
    • http://elma1.ru/!upload/files/49082359443.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wavipojudaxifutox.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/vifekufaluzuluxu.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/lusigazagovulufumeg.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pojapemugomit.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/gexakelunu.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/88137429504.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lovesafukig.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/nezuwezo.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905105236502231.pdfIn PDF document text
    • https://invest.pl/userfiles/file/252055661.pdfIn PDF document text
    • https://jin-ji.com/upload/files/95950880865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=to+do+list+android+widgetPDF 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_off0000bf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 18616 bytes
SHA-256: d6db7c3acef2691d466cb29e216baee2f644262342548c3e944dd08397b9ec99
font_02_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 10472 bytes
SHA-256: 9078ba9b4584d3bae0e3bcc5012eb6c08a2f9fd8fcd6c48065a3fe4bc0be6898

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