Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8936d8d0908204…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 09:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 96189079ffc8b2d35102507c9b9a0d4d SHA-1: 4a5775fe077aa0ddbfd11d79e98bb5cbd5029abc SHA-256: ee8936d8d09082040fcc195d711084d5f2acda27aac617c477a771301ca11e91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a scheme to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://myclubowners.com/userfiles/files/zuvimudoduwumef.pdf In PDF document text
    • https://senarathgroup.lk/assets/media/file/febiboxawaw.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/92680503425.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/27459743505.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozawifepiwigo.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64564073970.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/62438349460.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/24416411882.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/pexananegub.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/safibejarejeperowovorop.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1797b5c5---84013381542.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/88049775968.pdfIn PDF document text
    • https://ksuskalology.com/images/file/wemulalixumof.pdfIn PDF document text
    • http://meta-min.com/files/wizidotegegemavekavupu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/zewujisovanumofezumepas.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/buroneserubapawaj.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/sifuxusemotijaxam.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/tuparufinofo.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/86106386843.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/beteguran.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/pufomu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/63542891679.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109132252274811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+and+android+games+togetherPDF 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_off0000bab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB6 16508 bytes
SHA-256: 47ea737c651d28399bc4a34ac5e6c570fbcefa9e705a2916caff7785f6920aee
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10744 bytes
SHA-256: 53a583510cb1bc31552c090ff5275d4580456cc9307a21969513c5b9746f159b
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1