Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb312182b8cb179…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 13:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ee3a65d697160f9321108c6fb649a6f SHA-1: 87d0b0f790f6b5640f3649b31c1fb9e61314b0ab SHA-256: cfb312182b8cb17924ec74efd062c951b8e06b0e1ce39729dc1ebd4c5bbbdb17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://mahanakhon.pacedev.com/ckupload/files/tobuturitexi.pdf In PDF document text
    • http://stauarchitetti.eu/userfiles/files/rugasanuwenoworezi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/457d943fd1599c11aad81dd8cec91ca9/83826636255.pdfIn PDF document text
    • http://salwex.hu/file/65437283599.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/7386456554.pdfIn PDF document text
    • http://www.bash.cl/media/file/nuretiv.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/35908244141.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/tunizodi.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/luvenomudamuvakawo.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/tozotunakugawidum.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kijaxo.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zonixeva.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/fukijis.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/24209533201.pdfIn PDF document text
    • http://rinsacars.com/files/others/62182667141.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/mizazagalax.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tokedevifanoxal.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/10343618162.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/88277799855.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kusubukelenafomimov.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/votisu.pdfIn PDF document text
    • http://husplaza.hu/editor_up/vorijagijadalani.pdfIn PDF document text
    • https://network-italia.com/file/97225868955.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb88f1825---jesakanaveviware.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/88216266947.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rerapiloxenaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jungle+book+cast+king+louiePDF 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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16592 bytes
SHA-256: b3b9eba56e4fc4e47ccf74cc9264c3032d2a4b892e623009751cf00bc5d12604
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 10628 bytes
SHA-256: bd94f715bbcb14f08f6c239ed11eef81e3073116af3f91e544a67a3c82b7d64c