Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1a73525d13a2c2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 12:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7889f4b221ad79431f337ec1d902093a SHA-1: 23a778bce41641d292269ae4957cc2e134ec4e7f SHA-256: cd1a73525d13a2c29cae9918b83bdf34ce166fc7efc5a214ae1d1c81bbd8fb22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded JavaScript stream is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aaaexpressac.com/userfiles/file/19633876868.pdf In PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jozak.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/dulijowo.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/94590363827.pdfIn PDF document text
    • https://dhesient.com/media/busudabaxo.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fuvefotijakukatudajam.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210911163134614647.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/baderovixunizufa.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rapif.pdfIn PDF document text
    • http://119pump.net/d/files/86656722213.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/19514552870.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/89731348285.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/83111381309.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/78163565052.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/zofekivesemelaxewarajow.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/15615912149.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58f02d56d---vekoberutileb.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/97287782891.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/lawirobuzil.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/99067209165.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/pisizelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=metal+slug+gba+romPDF 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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 16580 bytes
SHA-256: ab929aad6fa2e12a2d375d6d0fea7ea4c7ab9804be20039ddb822ef7f289e02d
font_02_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10488 bytes
SHA-256: 349b9ad8de0f888e44543d4a2e8ce03a70c32fe91ca05638e3fdd6881c11ea81

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