Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9721105b716d83…

MALICIOUS

PDF

93.7 KB Created: 2021-03-17 03:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3708d800821e91bba1d4b5e0f3c522 SHA-1: 78916e6f8be6a5da027c8a90ca729b9bebca5160 SHA-256: 4b9721105b716d83367360394b714c11dde1bccef6d26bbcbbc2a5e78be4c947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to marketing research samples.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=marketing+research+pdf+sample
    • http://anstel.pro/64450032701xgx86.pdf
    • https://cdn.sqhk.co/begokaxawip/8hc6Jjg/ant_colony_optimization_python_github.pdf
    • https://cdn.sqhk.co/pobisobat/ghgeI8F/dusodidi.pdf
    • https://cdn.sqhk.co/momogajopi/mMfRNB1/aiming_high_school_of_performing_arts.pdf
    • https://cdn.sqhk.co/xafogatok/cvijhay/pulakaxepigupopitegixid.pdf
    • http://usesol.xyz/kovuteghcm9g.pdf
    • http://qupieasy.online/barcarolle_sheet_music_freej1goh.pdf
    • https://cdn.sqhk.co/lojenozasila/hpYOhiE/istation_logo_png.pdf
    • https://cdn.sqhk.co/jenireni/n1idEKL/40152200554.pdf
    • https://cdn.sqhk.co/jinuzekovodi/fFhdhcV/oman_horizon_fitness_centre.pdf
    • http://callipakk2.site/fonunavamujuzatoxusiwusjnta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_7d78f35acf5141a6b2bc3cb6574a7636.pdf?index=true
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_72c8f732a94f45cc82aaebf4af435e8e.pdf?index=true
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_ada77490d81847ecb6b1f009428768ea.pdf?index=true
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_f8d2b4c2b94945e4baa72a232e623a6b.pdf?index=true
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_27891138c0834ab5a6bc87c097e677e5.pdf?index=true
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_2e0fa379bdc5446396c64af37cb59da7.pdf?index=true
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_1dd11fddd64941c797ca95581ce84d76.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_8a6362c8a30043f694149b6fa0033f0d.pdf?index=true
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_5b859795e54f491c868275e986f8a235.pdf?index=true
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_31b161b7d89c48f4bf9ecd9c4d28ef71.pdf?index=true
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_bcbd2bf98994465fbbf274746668241e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011655.bin
dd2c810e4d6f223cb2c8f14130acc3e6441d3a260ee7dd7741873e0ebc3bdc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 5640 bytes
font_01_sfnt_off00012970.bin
2b6001e937916baf753c5f1f353a5fae664980a844b935d3de94e4dfe1a100bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 10768 bytes
font_02_sfnt_off00014e5c.bin
8af778eb6b861118e70c91d50b7e2256203cc609803335cc26a4971f06564597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5C 17792 bytes

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