Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b42d1e01bf3ce09…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 14:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77842431be7b2335254f913c04b5c01f SHA-1: adcd90536c84c5e20a9d6b4faeaf4711dbc0eb09 SHA-256: 5b42d1e01bf3ce0947e2d541f56d68dfcef5e7cb00e3b0a223bef6888a4667cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript stream is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=how+to+screenshot+in+redmi+note+9+pro+max PDF link annotation
    • http://duszek-lasu.pl/userfiles/file/40081080983.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/57609439428.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4710663595.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/mipumeredomadux.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370db81aa3f---nokakiw.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/forimabolojifozano.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/8827711388.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/38608626342.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59011366086.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/tupenez.pdfIn PDF document text
    • https://efnnma.org/files/file/pupaj.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/77199524977.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/fixoma.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/sinovamulemomomijavadili.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/kakapomugejovunorulu.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7014131432.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zupusarob.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/pijade.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6c524b72---lexonetevasefi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jigane.pdfIn PDF document text
    • 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16564 bytes
SHA-256: a76631d80496d777c03d1f5d6da19ece0125c3fc98309862403e413e332db642
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 11080 bytes
SHA-256: c63a4e4a4fb7d6cbf276a2c6e1287a62b0d3e7c630c7c74b04d9b4bff2ea9677

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