Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ecc3e7ccfda39d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d17ff56a478d5a5eb34bf230b608a553 SHA-1: f507de4fe19466ce3f78484f4d67406f4e0e734d SHA-256: 77ecc3e7ccfda39ddb690b9d6c1b439885d7905c8a4eea24aff5f31d6e4b937e
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a browser extension installation lure. The embedded URLs, particularly the one hosted on beckydavidsonhomes.com, are suspicious and likely serve as a distribution point for malicious content. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197a1f1dfa---31820923626.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/58723426998.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73947863787.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/29198500458.pdfIn PDF document text
    • http://client.diffuse.info/files/vevovo.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/64789405309.pdfIn PDF document text
    • https://rintrans.com/files/mizano.pdfIn PDF document text
    • https://vendax.ro/files/file/mulim.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/mazutumuxilo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/zuzizatuxoj.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/84961525822.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/setibefubapojofelotem.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/petededinomenanajus.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Kecq4O746mYf7H5O.pdfIn PDF document text
    • http://palami.by/images/file/fojovew.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m931vpkooht2u4ndt48g3pj6i2/3418619675.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/88094947681.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zemoneluvitororasu.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/kowafisutalaxijasozorepo.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/68117083656.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/tegegiludumubovugomibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+lock+screen+appPDF 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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 10480 bytes
SHA-256: b8728436f9264f37701cbb642de4b5bec6d166a8e8140b5a20f6ad64c0264512
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 17364 bytes
SHA-256: d254196b8e4ca995a9ffde8a906e0a496c5387667be75a99bf69090c50b99a26