Malicious PDF — malware analysis report

Static analysis result for SHA-256 d914ea69ccc01eae…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 23:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6503b98417f72452079a9dd222307bfd SHA-1: a9ed728efc6fc1265bbf574d3244b240acd72e2d SHA-256: d914ea69ccc01eae3b5533a19c9053f8621fed778433145153b8ca98c66e7ffe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.alex-vasilkov.ru/images/wisdom/file/jexezobogopuwirujalovofix.pdf In PDF document text
    • http://gamecoast.by/uploads/files/dukewamomalobelufipexe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7a3c144d---derera.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/juxepumerudadowokelo.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vifezelobedugeluw.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/75307110668.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vizoramojifa.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/57005939695.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/29596607148.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/90044571233.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/mopirol.pdfIn PDF document text
    • http://mylodge-naoshima.com/miwaxofener.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/momizanaxigupuromigura.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/75561755007.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rupor.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nukowabebev.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/53410701757.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613243c9086c0---96770210582.pdfIn PDF document text
    • https://cargotavio.ru/files/file/26097617817.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/6327156068.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///98913525155.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xekodaxunufokov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+create+qr+codePDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17652 bytes
SHA-256: 5d969fa983c1c3e8450f58a9f1fd1c6b9bdc18da183f3bd634de624048f57804
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 10276 bytes
SHA-256: 5b5a111d2f27f3acff6971670523a70934d81a5b2fe8c9f7cccf87f0bf07a20b

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