Malicious PDF — malware analysis report

Static analysis result for SHA-256 104c4a0db6e1d022…

MALICIOUS

PDF

84.2 KB Created: 2021-10-12 22:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1771a1b03f18b7e31ddfd2f9aaad295 SHA-1: 6d772f198fb34736a228deb01e933b72fa1b6f63 SHA-256: 104c4a0db6e1d02279c1e6ab0315b4993ebb02e498906920043b2e6932486bf9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many pointing to potentially disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beverly.kopanramen.com/uploads/files/vonaluxunop.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0cac042db---15680116384.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/darafeduwu.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/81290698537.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/6127398648.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/zamosebolakufovu.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ruvevasuwewilafumuzetalux.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/gonebetozazinilarilena.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zosumu.pdfIn PDF document text
    • http://kolesa.sk/files/923225566.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/90346951802.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/12858757096.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/130273892.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/77480814965.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/jelapatizemeviwugezejeg.pdfIn PDF document text
    • http://cpviettin.com/upload/files/4954653539.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zofeve.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/pugazerowutewojaki.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/19128465528.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/56bf8e5a3e0b6934d30d8dabe1d6fe82/47605066602.pdfIn PDF document text
    • http://hjhchem.com/upload/files/pezofemat.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/99657118233.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/jejirijolizuwazigi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=until+the+fat+lady+singsPDF 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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10532 bytes
SHA-256: 8839fa1dddaa80a13c99d6b9ed122978ce9927641d7b99e9d9a230ced54d4ea4
font_02_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 20156 bytes
SHA-256: c0786b046f4ccc5f424db62f30bb8dc98a743f58715f07c1f4a391e9b01443b3

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