Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e35faac50b1008c…

MALICIOUS

PDF

82.6 KB Created: 2021-10-20 08:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cdbc665e014c39e7c8eb9fb60ca922d7 SHA-1: 7d089a2a7d56f19f52d7f5554cf49c9b3cdd28b0 SHA-256: 4e35faac50b1008c3b2bd17ed09e7901c30084863659863b1a01399a7dd705ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to potentially malicious PDF files, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a malicious intent.

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 http://koreadramatour.com/FileData/ckfinder/files/20210929_3A251B2A1C1929D4.pdf In PDF document text
    • http://upnbkk.com/file_media/file_image/file/nuniwuzu.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/paxivuguluzuduzibe.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/vezavetax.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/vobiwilowibowus.pdfIn PDF document text
    • https://kultmotor.hu/images/files/53806155543.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/49593340421.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldvlek6vdamh64ic4iore0bln5/xetopimisa.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/guwekizo.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210904_F179188EED408A38.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pomemoxebixigenas.pdfIn PDF document text
    • http://esistore.be/userfiles/file/ralaperumiveseribu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/lavezug.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/xanededif.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/kevuk.pdfIn PDF document text
    • https://phnews.ro/files/file/xodeburarigid.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77960516426.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfcb54aa41---61874864066.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/68507430411.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/xozajubakijim.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/desajobodiwodajixewote.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sumufogapolozoza.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=how+do+you+import+a+pdf+into+a+word+documentPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/62520453806.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 10860 bytes
SHA-256: 93328975b83b50f9897ad06c11ef6b75485be5bd8ce5938011bfc428595b856b
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 17536 bytes
SHA-256: bff4ebf323ff6a03d9f54d23ad009b9716f0b494523150de930b5a6783b0ef9d

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