Malicious PDF — malware analysis report

Static analysis result for SHA-256 61024bcaa092691d…

MALICIOUS

PDF

62.6 KB Created: 2021-09-23 07:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18dfd016093ae79fdfbeccfef2207e10 SHA-1: 3a6bd61aa2f6519c64cd3b8a86c8c0eddb86d4a6 SHA-256: 61024bcaa092691d540c83f7e599d41c748064e3fae00a1b07993b597c7ca80f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6497

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.
  • 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
  • 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://8cj2aja7-8mxb.com/contents/files/92574887939.pdf In PDF document text
    • https://granitabrasive.com/editor_up/muwefi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/rularozesopugozizivijuk.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/66200044805.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/ruvubizupebenugixu.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/nisodexiwekenazajuki.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613575dfecdc4---winikew.pdfIn PDF document text
    • http://uteambio.com/upload/files/jogapilodiximijedeviluzi.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/veveriv.pdfIn PDF document text
    • http://zae.me/datafiles/file/susefusofaf.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210921020420.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lolulabibogolij.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/31662863170.pdfIn PDF document text
    • https://razredna-nastava.net/files/78763935976.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/67295055527.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/49498710545.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/wupigajojomepadukuwozerur.pdfIn PDF document text
    • https://value.ae/userfiles/file/17124846975.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/98978433006.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/nazamifutanofed.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109181344458262.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/gurupomanedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=infinite+flight+simulator+all+planes+unlocked+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 11208 bytes
SHA-256: 4a0c788ca4b5f6f6d858169cfea4d4816a7e6bbb4fb30e4128ef0d84da93a806
font_01_sfnt_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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