Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a7f2d94a093cc9…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 23:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6bce4504467430a51e2da24e1c6adb5c SHA-1: 6f50908bcc43673ba7f435924d386a9dccbde497 SHA-256: 97a7f2d94a093cc96fcae7db4a643da524125825e7c44d26cb75d28621d24a06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cakesandcupcakes.net/userfiles/files/xuvoj.pdf In PDF document text
    • http://teplorium.su/userfiles/file/wuditefonud.pdfIn PDF document text
    • http://benetalent.com/upload/files/zuxodisuzener.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/14029731691.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/benozatokom.pdfIn PDF document text
    • http://htygroup.com/upload/files/bolejore.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/tizulodamaveropa.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/79510425270.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47dbde7a8---40837999080.pdfIn PDF document text
    • http://yibetter.com/data/files/70795479258.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rotejidenajixenudepew.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/zazexuxumipoga.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/79148908255.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fizexikogelorela.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/supopipamobovul.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/rexirunuzozojesijokimage.pdfIn PDF document text
    • https://vitanov.rs/files/47694278716.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fekopowitebetogosivozim.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/76647149659.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenilexikobofe.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/68599800073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+block+a+call+on+an+android+phonePDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210909/16311889694654.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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 17388 bytes
SHA-256: 770bd74994fe70081605c6a2d2afa79b94f90ed6837c4f1e101f2aad49bb5c80
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 10868 bytes
SHA-256: 2de436a650047214f7b80fabff8ddc121ae74f7303bf83ca5e63a3e1ef3f1323
font_02_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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