Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2ed2d50d604552…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 23:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15b47a9c710fb68d2aabd8f0b7fca826 SHA-1: ab2e1af66a6f9904cc8409da6d5acb1367f8df5f SHA-256: 3f2ed2d50d60455219116258b30a33d4d19ebcdbd37b4a1c6fd7180154d7a578
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=bubble+shooter+3+free+online PDF link annotation
    • http://www.depomatrial.com/file/56214953022.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/88420069628.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/6244160376.pdfIn PDF document text
    • https://langumeistras.lt/i/File/45263014590.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jomobegazovol.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/30603001594.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/tupixedusufumobesisaw.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/fikekunu.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/72576971993.pdfIn PDF document text
    • http://imoroz.by/upload/file/99925806246.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/70807875836.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/batemepukedomumef.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/zepuroxezimoveruvu.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/sevorofezupaziwujipiwum.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/xofiruka.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/64797028005.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/81275860324.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109060656223939.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/rolalimerulizupi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341f16b10e1---gugotux.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/47387897395.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367f19cad19---sinofatebogunegefewugizug.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/82515323624.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10616 bytes
SHA-256: 5e49d0fefb531f1f329a5cd432b6afbd693d5a287eeaa7b3ae05f41bd6ee52da
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 18768 bytes
SHA-256: 4986070eb8965e605e982bfadcf0ef23f09fb6f2e3d103b838c38fa57feb4bbc

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