Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b40757dcec758d1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 05:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebaa1c6052656316d00114e9b7af34ef SHA-1: 986d97b6417d8cfd1b7cbe0280d91fdc8cc74d2f SHA-256: 8b40757dcec758d10307faa2c39609388177bd1fe8b25ff17d75de83b81583f8
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to other PDF files, many hosted on domains with low reputation or using IP addresses directly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing. The document's structure as a link farm suggests an attempt to obscure the ultimate destination and distribute payloads across multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studyhalltracker.com/files/file/luwogukekefepikotesa.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/69178686229.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/21461145657.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/kafikurawuxa.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210911132431425502glkr5.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d9a09e4e758d7c05af42ff08a31864df/xevekikad.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/zasosagurogalefagulakin.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/95038522822.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210912_132757.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddcebc0f4---boluvifavaz.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/vubopukinar.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/3602950278.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/59044996389.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/baxobidijeku.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/30162270061.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/ninujurigezulelutudiju.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/takotozelitipiruduri.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/wurivodoliraz.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • http://edusfera.pl/upload/file/befezitowugar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=paris+nights+game+download+for+androidPDF 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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 10888 bytes
SHA-256: 47e3cdc93bc7fdee98038d8a85cf110a6c2adf55036851d0f9529936c1f52405
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 14976 bytes
SHA-256: 2c8baa02666c5eaaaffa9699d145af3481bbf8ea6c29fc13973c594abecd6bc8
font_02_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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