Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead563b8abfd965e…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 08:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d8ccb13d3b609deb0900a5ac032a0ac SHA-1: babead5b96b14a43ca552a445885e110ed27a6c5 SHA-256: ead563b8abfd965ebc362bde9e280ebee6cdf1c2a5d374138eb3e71d45265194
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://permanentnimakeup-brno.cz/userfiles/files/patobuligeti.pdf In PDF document text
    • http://stilna-ya.com/_userfiles/file/movenodupefososuven.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/42725798298.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7a73e71bdacf36c4ea86a1105bc31e0e/rukakokipijuzudagowuda.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/33943728253.pdfIn PDF document text
    • https://premiersuli.hu/files/files/61946478714.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/gisalutise.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zisofadaki.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zefem.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/43194231175.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9156319075.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/20679235308.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mipemogujedipanejuvobi.pdfIn PDF document text
    • http://loby-scieries-dunkerque.fr/userfiles/file/30404814360.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/lasukidegoja.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745b43aa7e---kemek.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/54227809165.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/61166651806.pdfIn PDF document text
    • http://opsir.eu/files/file/80194890924.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/rumibog.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/98137338320.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/95613759461.pdfIn PDF document text
    • http://slotkuda.com/contents/files/xobaxeditagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=guidelines+to+follow+when+setting+achievable+fitness+goals+include+all+of+the+following+exceptPDF 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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 15764 bytes
SHA-256: b3f13950e71995f2a2b2574fc158044c7bd33ad46be7315f19d45f13f4e0b4fe
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 11332 bytes
SHA-256: 3db493ebf33896720ca58c9f81f6f2688d8c7d26affae808429cc2e374473282

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