Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eec6c4d5a44a537…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 13:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad7e9b55a4e90dd35f797b029d9dcaca SHA-1: 99798ba3a8f874563d468ed7c2c956f7d04632f0 SHA-256: 8eec6c4d5a44a5375ba6d58012f042b0f6c4400ae169c472eb78542a453a1535
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t61p2e33vpl8nkkl002qb6gbq2/75134186170.pdf In PDF document text
    • http://syntrend.critical.tw/upload/files/41901146018.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/digogomib.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ruratulogi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lirakidazinimajumija.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210911_200440.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/71979876871.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/36933357590.pdfIn PDF document text
    • http://salt17.com/userfiles/files/durijidonuzovobalob.pdfIn PDF document text
    • http://simoncaulkin.com/images/baxusip.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/komavidewazaw.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/guxogawixa.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/96261747959.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/donoxanuworu.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/jiwobek.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/purok.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/83412238357.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308acf9f233---parevefesakemi.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/bakevusirofenemedid.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/39022007937.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/90348140248.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/86267680552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+post+movie+streamingPDF 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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 18120 bytes
SHA-256: 245a4baf74cd75645ad5c79ab999a88bc97d3b11ef72d941056426a1d0957ded
font_01_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 10684 bytes
SHA-256: c6a561f40ac8037ca3402d2b4d54a16b6fb8f83a2ff86e4ece070250da79a8e5
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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