Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad9f6dba2d71a98…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 05:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24cea7ad105e2168eee660529010408b SHA-1: caa9be2bc2db8a6f65d88872c52c65d4f6ed8746 SHA-256: 4ad9f6dba2d71a98772ed6288966f7fafb639f9d77ba9a37d6dc321a4aa953f4
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=chandni+chowk+to+china+streaming PDF link annotation
    • https://sailstudy.in/ckfinder/userfiles/files/winanugebekoji.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/wirogukazetikudorodo.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/84962826885.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kuwisuzaxakutanu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/335e55f2269ab1fb4aceb0eb31a11029/90189199058.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/gabegeresa.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5b8c8af0---nigakulumeler.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/43592100076.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/kulaxilaborovanunan.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/11498720128.pdfIn PDF document text
    • http://schokobrunnen.com/idata/78031519294.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/woxagib.pdfIn PDF document text
    • https://equinox-e.com/upload/files/76367795277.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/55805850145.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/77972545866.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pomesejawesunab.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/23261835959.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/58175743650.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/53268482974.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210923_000852.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zikor.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/14528652835.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nusobegujitufi.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_off0000b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 10980 bytes
SHA-256: a1f2e3ddf2ef3b7bd3441dfd6d3a65850d455ae2dbb05cf61caba905aa90cd9d
font_02_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 19568 bytes
SHA-256: 9fa50ae0b9b77f76fbb099af307d9d81c32d8e23e35e564dab46d215d4a84dc9

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