Malicious PDF — malware analysis report

Static analysis result for SHA-256 2845c94d8d23b405…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 00:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07d57cfa45ab4526d718f0a39142afdf SHA-1: 591c485f597d47006500e3b9b858ac67b0ee3c86 SHA-256: 2845c94d8d23b4056c16bf2a332e41efdf65eb0be8d689553bb9f216c1be2bac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a likely attempt to manipulate search engine results or distribute further malicious content through a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614627927c088---fupilabomuxotuzusebas.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41a7bda52---domeb.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/77845171178.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/dumobuvena.pdfIn PDF document text
    • https://intersat.lv/files/file/moxalanoxipiwivowo.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/9158427306.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84487984895.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vitapirisekotadokajis.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xusovizizisafapiwaxanur.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/gewuzopaletudawupikizojo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/58178908469.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/vitibutobomanutofex.pdfIn PDF document text
    • http://synowka.pl/galeria/file/19045915911.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/50525050340.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/gifolidevi.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/84613182404.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/mijebujakus.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/97484260607.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/76304929476.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/37702100882.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/22471617123.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/10590607834.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/44676540778.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/83722873605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=super+mario+3d+land+3ds+downloadPDF 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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10888 bytes
SHA-256: e08b59491a798759f3d854eaedc5d5d5fe0cfc46e5f1f3af62e04264db6ddcfa
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 17856 bytes
SHA-256: f35394ca524502a4d094a8eba7d7a9ba0936613d83ccd9434c6319fbb3b561bb
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1