Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f24cd65324f324…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 15:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adc782b348b86972e8b1c3bf1b9140bc SHA-1: 4b81792aeb7aa56cb4bc86755fc303b4f5d42eac SHA-256: 85f24cd65324f3244d77d8c77537e4fcbcb6aa89aada89cd2a38132a30c57f2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a series of external URLs, as indicated by the numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed3e672ff1---86822684736.pdf In PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61578721959.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/fowusogugurafugobe.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/denufikewipefazada.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/541787453.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/jaxufanafokelerafer.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/mumeruxiludetudekumidepug.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/welejaxifelabufilalazapi.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/xitibitolepejodi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02ed38daa---43014897863.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/72909665239.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/76501184176.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/mudopaxikiwata.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/jurun.pdfIn PDF document text
    • http://orlickachata.cz/files/files/82331516642.pdfIn PDF document text
    • http://teknis.it/userfiles/files/1520824525.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/dogokitibafageguwosa.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/95360339804.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/82718597989.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/keragilisegaleduxo.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/witovezada.pdfIn PDF document text
    • http://seritour.com/rsm/files/punax.pdfIn PDF document text
    • http://moretonassets.net/userfiles/fatimobidukixa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/gogifenamo.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/70562022358.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/somupapek.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/majabifexilasixugepi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/18519921642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=brave+dark+mode+extensionPDF 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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 19484 bytes
SHA-256: 7aa123f78ad64b8c3bfcfaca01f38e13f318fa4bfa1993456126704a09db023d
font_01_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10676 bytes
SHA-256: 1ae5af70165130b05a49581edb1323a3769fabc8b9bc7b886b67b7c25d125563