Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ed2f636b9c28e1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 17:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c45def8a04938bf2358ec03eaa20e2ec SHA-1: 09f8d2d436a8940e6fa433ee81b3367093ca8535 SHA-256: 63ed2f636b9c28e12c3266cee1667d0beab876ff3c19c8a9675734a4c33bbb56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mbamantra.com/ci/userfiles/files/91567330629.pdf In PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/24256011664.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/34202473550.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797e7adf4b---misupezali.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/66256614301.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/lisekuvaw.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/74134970373.pdfIn PDF document text
    • https://wonkingchina.com/d/files/57302537704.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/11282037381.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210915225427690954590.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/80211422443.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wafedufisawofuroxibetaven.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/27473695677.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/nakowotexitu.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906022544469.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/92905239165.pdfIn PDF document text
    • http://parentini.it/userfiles/files/makazuzerexixexifemo.pdfIn PDF document text
    • http://gabortech.com/admin/file/24578093395.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/37631266663.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210916130256.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nepeburikuvazox.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161342ee24c64a---33841090759.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/metobobaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+carrot+rich+inPDF 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 10144 bytes
SHA-256: 983100d89b621b1998335d9ee622d3a9e608968e0012ae162d7ffb572cb9fd97
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 18312 bytes
SHA-256: b5098093fdc59bcb45310b37050760ab535bc5549394d9e3e1927b966a70d0aa

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