Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f73896a1d632624…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 15:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed0cef4f96f850968d82eb7885b85877 SHA-1: 9fef8b6f9336338d17d2c7174fbef8d67396139f SHA-256: 5f73896a1d632624ed681b174c5719778e71a122e5afc1f6a9a7fd3ffb108bd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains or link farms, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jeevadhara.org/work/london/userfiles/file/jukulugobarem.pdf In PDF document text
    • https://vinatech.com/userfiles/file/84884291095.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/31190660011.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9a68b00d---2821632100.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/61652640030.pdfIn PDF document text
    • http://steinemann-ag.ru/16522316599.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/83812671757.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/mukeb.pdfIn PDF document text
    • http://netart.hu/userfiles/file/riwedopagekizefaz.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/96208179236.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bizixasurufobisuwazo.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/90370401813.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/47676566709.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c999694220---4444176696.pdfIn PDF document text
    • http://sswjeans.com/files/purodadaren.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/23461369734.pdfIn PDF document text
    • http://gaudi.tw/upload/files/36696467526.pdfIn PDF document text
    • https://casaalu.com/luutru/files/96905790411.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/22511557655.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/67376088542.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/wonubazat.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gewibemumid.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/262522262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shareit+premium+apk+no+adsPDF 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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 10876 bytes
SHA-256: cfc34257d930c72a7da4b790a522f8791f2a91266afb7db33da5da11f623273a
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17068 bytes
SHA-256: 2466ae25ee7d4f678ce6812a66c5ea07504b37bdbfae3a366d193ee2d918795b
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1