Malicious PDF — malware analysis report

Static analysis result for SHA-256 586208d205ea4076…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 14:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04456c0f9874de51d1bf4384044cfc46 SHA-1: ab46624b459f9fe04762d514c1feafb4cf5cb9df SHA-256: 586208d205ea40761b40a733b4ab4258e0544a8d0d0173f7eaf2c6574774cded
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded links, many pointing to unknown domains and one identified as a link farm, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the structure and link farm heuristic point to a lure for external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cn-junsheng.com/upload/file///202193112322122.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613798f5d6ee5---33808642584.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/febiseronijutupaw.pdfIn PDF document text
    • https://medius.sk/userfiles/file/numujumifizere.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/89314311756.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/rigegi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/25209277790.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/94818913301.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/dujobolofofe.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/7194553847.pdfIn PDF document text
    • http://askort.pl/Upload/file/gikelezozirolitadoke.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/63521988555.pdfIn PDF document text
    • http://blueyee.com/upload/file/07123052447.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/54305981942.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/sowunole.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/woziselef.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/21074970512.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/26673573838.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gewemabetorezor.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f23011c9905ec611654e541e49ece944/49231076108.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/wipajilelukozag.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/91842126427.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/fabesorofexusegejob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=apps+para+android+baixarPDF 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_off0000b8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 16936 bytes
SHA-256: 1ddb544c02c97fd67f4fc244c2d6ce5e11c306be2ab6151196dc6392bebc87a7
font_01_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 10332 bytes
SHA-256: ed9d3fe3c222263ea8ba09be7179cccd156b6e0f6832030464e2915584bee0f2
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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