Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eb88b507023dc3…

MALICIOUS

PDF

62.6 KB Created: 2021-09-19 15:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 76102b290cfc9cbf9928657ab2032033 SHA-1: 679855fff0f2e2a91785fa902b667373a0e91b04 SHA-256: b7eb88b507023dc391d144171fb3deb7f6e81f41c9f7a8caafc3cb45e13f318a
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many hosted on disposable domains, and the ML classifier's high confidence score indicate a phishing or exploit attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this, suggesting the JavaScript likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8819

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://infrive.ru/uplcv?utm_term=app+continuously+crashing PDF link annotation
    • http://xedaptap.net/userfiles/file/pijapi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613115d617838---xibuwotu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21920870649.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xojafosawekufefa.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fisolanedilabugexozerudiz.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/45757534140.pdfIn PDF document text
    • https://hirurgija.me/files/zugubavumukuradadadoranug.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/91504554860.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/74652261853.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/woboduvozafo.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kanuralubap.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb2cd5b28---60738778717.pdfIn PDF document text
    • http://ifap.it/images/file/siniwo.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/sukixo.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/wuvutakowoto.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/70664176815.pdfIn PDF document text
    • http://xycrusher.com/d/files/nowosubonozetibufazut.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/wubobuxixadi.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/21579533173.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_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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