Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7d84887fca489d…

MALICIOUS

PDF

61.0 KB Created: 2021-09-09 06:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3466b419cfeb39a5560f02b6d7074308 SHA-1: 1dca583599a23e48b1f283269b33cf34228b0ae4 SHA-256: be7d84887fca489da9362e8b7ba269c38089f2d441b79332071f102a0f88a837
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier's high score and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9347

Heuristics 5

  • 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
  • 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=because+in+a+sentence PDF link annotation
    • https://ylwlgwadmin.ylwl.cn/upload/files/79974580963.pdfIn PDF document text
    • http://osayit.com/images/file/81360969934.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/30263128660.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/92032511393.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/1296852754.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46353258999.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/75961611495.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/98005221927.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/49962906235.pdfIn PDF document text
    • http://epmachine.ru/d/files/biregexezobimeli.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/51862526540.pdfIn PDF document text
    • http://iwort.de/userfiles/file/nesuguf.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/20561105753.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613716cd6dc01---mojerikugar.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31037641348.pdfIn PDF document text
    • http://hainfelderteich.at/busomukidojunaji.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/83864657777.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/vekigujivawelabozivape.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/25215638049.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/87444964353.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/54567701588.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1faf3604b7a2329f3785c49633a397d4/xutajunivunofiguvelep.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/degaporune.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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