Malicious PDF — malware analysis report

Static analysis result for SHA-256 948dcb18c4adc89b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 04:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78d361324ff057b0691d2cc34fe4fb8a SHA-1: 440e3d34ef5028b0f0052c2a68bd1bae478a3c37 SHA-256: 948dcb18c4adc89b5566b7a3047d00acae13bb52c135471d81f762d5e37f82f3
74 Risk Score

Malware Insights

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a large number of external links, many of which point to disposable domains or are structured as link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://ksklinika.ru/ckfinder/userfiles/files/tetuzepekasitekej.pdf In PDF document text
    • https://metricgroup.it/uploads/file/40572696815.pdfIn PDF document text
    • http://princeverma.in/uploads/files/31204184353.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/tajazabenekukuzagulezo.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zikotigofajawazawofuji.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468ca651a78---269223723.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/53188072356.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/wigugutosuferukemixu.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/19525391305.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wobezet.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/towozeb.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/33666456273.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xokafoxolejejap.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kegise.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/regeliwebew.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/66442524247.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/mubezomikidomilibanut.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/96235475933.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/26926961443.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/milofimelevuregonoxegotax.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/29684222133.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/nepobolul.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/7966422729.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/24794552551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=extreme+car+driving+simulator+hackedPDF 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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 17312 bytes
SHA-256: 6d6bb014b4f47111ad07c7580f4f764cfd144dab18fbc576459822d7f06eff24
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 11160 bytes
SHA-256: 7ba225e2f91ea7a47ba98985100d6e73d20d68ea5a27a56c9d08ff0111e5a18e