Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90d23f4ca0c8344…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 22:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a79dff7ecc77c037e8570d1eb9695080 SHA-1: bc723c52d8eab6fcf47ee399ccc8954a6fcb5a5d SHA-256: b90d23f4ca0c8344aad481c4678843ef50abf8d1aa69231dafbbf02acf49385c
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a chemistry textbook, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=chemistry+an+atoms-focused+approach+2nd+pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600a9f9da6780.pdf
    • https://cdn.sqhk.co/jodariwem/oUoxzSN/93089741026.pdf
    • http://milafikolume.iblogger.org/the_wolf_among_us_mali_apk.pdf
    • https://cdn.sqhk.co/jigugabopu/EkVjbgi/the_survival_game_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4477409/normal_5fe872cf61485.pdf
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6018a072baf2d.pdf
    • http://gojoxoxuda.22web.org/2083224523.pdf
    • https://cdn-cms.f-static.net/uploads/4420014/normal_604de1e9be9b0.pdf
    • https://cdn.sqhk.co/vulovosovem/jhfQGCl/red_lobster_specials.pdf
    • https://cdn.sqhk.co/romemanir/lggz3ii/sniper_games_xbox_one_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4388285/normal_6009ffbd16d9f.pdf
    • http://pobegikobej.iblogger.org/59637535922.pdf
    • http://fujepopini.22web.org/15005157792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_967a11afdf024747b98529d55facce6b.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_ea647dbb879f4260bf8ca7202f902d35.pdf?index=true
    • http://nowuzapifara.rf.gd/83101108441.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_b2950655d05c4ef8b181556f1af380d7.pdf?index=true
    • http://pakewerulawe.rf.gd/baranauskas_anyki_ilelis.pdf
    • http://dofumuligo.rf.gd/37896259220.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_8bda75e42d8847d3b1711cfc7314f694.pdf?index=true
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_c227d20aec4b4982b5cdd10d5151081c.pdf?index=true
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_9d3f11b2eaed4069a59acd438de6505d.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_3f781872c139405a916b0253f9970634.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_off0000dd1e.bin
84c74044a03f9858edd1dc7a1a634a72f5fc4fb5768c2e3d70ed8f0318db8025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5532 bytes
font_01_sfnt_off0000efd0.bin
86f78b13481935496187342b628acc94aba4469f35c847345e271cf0f750bddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 10428 bytes
font_02_sfnt_off000113fb.bin
29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16084 bytes

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