Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee7bfe0307c4d02…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 10:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d80e9f3dc517d5c0547a1a1389a4946 SHA-1: aeff53d32e287b02ed042501fc467f3feee52f77 SHA-256: dee7bfe0307c4d020bde64d0648b4876e7497226dc49c2a182c0c87482dceb93
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://gd-weimi.com/upfolder/e/files/20210905235138.pdf In PDF document text
    • http://greenglobepms.com/uploads/20254756685.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/sozatoruseporesamoguzoko.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
    • https://domilot.com/uploader/files/leromamebidusis.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/67527653450.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/64506040208.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55929363634.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/94349854145.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/vakewezekebuxebegabowim.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/1167205209.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/vubenonilorifaxaz.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/99512175778.pdfIn PDF document text
    • http://boxethai38.com/upload/file/53485497903.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/rexet.pdfIn PDF document text
    • https://pecintajp.com/contents/files/25163243448.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vumozupaxepotune.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/91839621597.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8a7613b2---ludaxaziw.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/juxanedeguxasibowizu.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/7185679156.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lexeleserobuniwalukesovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dead+by+daylight+apk+onlyPDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 17680 bytes
SHA-256: d1fa9c06c6c4af634fd1b66902a61092b8cb9c03cb52dd080aa19cf6986d3310
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10748 bytes
SHA-256: 04475619bbb5e38af24b00a36ef98ce3f9fa8884a57c0db1f5a83fed8355909b
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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