Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf340ce113cd2e9f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 01:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 137dc5349a36a77ef4f475f681c7c801 SHA-1: 798944c28dc8e4dda22e4369ab438e1f353aa54b SHA-256: bf340ce113cd2e9f8fac3fcb6b1ed8658d062cd8398d73238f4248b611fb0336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://novahealthclinic.ca/userfiles/file/zobitubedaj.pdf In PDF document text
    • http://astprom.ru/sites/default/files/file/jisazajumu.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/godudetuf.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mudekisotefizosepa.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xiderujisenodoputuzu.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/65307039573.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/raxaxegozeb.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/wurur.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/buwaxetu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139406932b5a---28220032392.pdfIn PDF document text
    • https://vientangluc.com/upload/files/36771883594.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7eb4ba5705928e424b567395037112ab/semoxok.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tudipowojo.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/basisufufudelovazedozez.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/29690519424.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///83950402296.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/35527820011.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tajesakuwuzuzesebuk.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/7162401586.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/95989802442.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/vejezikososakagofoniseteg.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/regiritijub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=m31s+live+wallpaperPDF 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_off0000c068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC068 10292 bytes
SHA-256: 55b2b9bba36e1a9b6fdc4b5d31181ca3702a6f53d9dcd0c8f5424fbff8eb286d
font_01_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 16932 bytes
SHA-256: 74679e457f29ce952611fe1b728c6318d07817589730b4787c0017c9444fc05f
font_02_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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