Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e94d393848eda8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 17:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 144fbd5d3fda96180cc4e0ad8e436cd2 SHA-1: 01e060feaccbc8b19b59dbf5571fa73cc5c86939 SHA-256: 85e94d393848eda8c272b92a3b1048baff4c3f513afd464b40009d8b1a11e1a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high number of external URIs. The PDF structure and numerous links suggest a phishing or malware distribution attempt, likely using the embedded JavaScript to redirect users to malicious sites. The numerous external URLs point to a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=android+textview+custom+font PDF link annotation
    • http://joyearland.com/ckfinder/userfiles/files/tafutafuw.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/14919079548.pdfIn PDF document text
    • http://arsvet.ru/img/upload/12632335070.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/23544735995.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/toxoriwul.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/53033459921.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/17453425127.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/19617637643.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/26960543043.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/76082392244.pdfIn PDF document text
    • https://gdaniec.com/upload/files/88675921734.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/pigexosisisupalewamojonux.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/bexotosanamu.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/45099351204.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/84229688518.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd792b5d97ed82a7b67bd17d90f9d128/sinadedadogivativavuza.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/solinifiramelivexi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/9158711259.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e802a642---31178143371.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/potolavawukupulati.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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 18044 bytes
SHA-256: 95be0a57af813b425c956c9eb608d1ffd4fd617e04b22fd14a0ea5a313a6303d
font_01_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10764 bytes
SHA-256: 5588a2301f028b0bd968db48ba8f672c681fdc3309b6f0e457cffa24ebabed24

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