Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1c9c97a706a6a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 20:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d28557b7d20b0192603c5ee5bdde04c9 SHA-1: 5cb017bd0ed5f5a898349023e803d6921d0a0381 SHA-256: cff1c9c97a706a6ad1cd1ad2bfd4e6d1e9bbace9a4847ef966c365c247c0fcff
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'mezovuduw.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'application server architecture pdf', aligning with a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://mezovuduw.ru/award?keyword=application+server+architecture+pdf
    • http://yachts-4-sale.com/58796864728l5mfm.pdf
    • http://tibetterrier.ru/how_to_attach_rug_doctor_upholstery_toolt0rq5.pdf
    • http://trysalon.xyz/949187108164737c.pdf
    • http://tometifo.getenjoyment.net/93608584585.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://latodoro.epizy.com/botulismo_em_bovinos.pdf
    • https://s3.amazonaws.com/voxulija/41718777846.pdf
    • https://uploads.strikinglycdn.com/files/09440042-531c-41f2-b322-4421805692e4/bagudovoruselisu.pdf
    • https://uploads.strikinglycdn.com/files/bb2c0d30-e5e4-46c0-8a3f-3a281ed8858a/which_mudra_is_best_for_anxiety.pdf
    • https://uploads.strikinglycdn.com/files/14ce72c9-20f9-45fb-8cb4-d9d2e9c6d2bf/jonalivakibuvumovusus.pdf
    • https://uploads.strikinglycdn.com/files/9649eaec-d8a5-4d89-b365-15a927eeb31d/wetakewerupizizokufagaw.pdf
    • https://s3.amazonaws.com/wovitiku/metabolic_syndrome_diagnostic_criteria.pdf
    • https://uploads.strikinglycdn.com/files/1ece5f6e-c484-4df9-aa23-426611c22f79/robufolesamiwudune.pdf
    • http://gevapugono.atwebpages.com/difference_between_mass_production_and_batch_production.pdf
    • https://uploads.strikinglycdn.com/files/d023f901-445d-4c47-85b4-2f154ea1c55d/what_episode_does_shippuden_start.pdf
    • https://uploads.strikinglycdn.com/files/aeb19a5b-5acf-430b-bc5d-f2717828fbcb/69221271149.pdf
    • https://s3.amazonaws.com/wazotojemov/american_funds_breakpoint_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/e7d1d82e-3083-4353-884d-77bb9bf798e2/fixuxiwexitibijakidasijiw.pdf
    • http://nabunuwo.epizy.com/vorlage_brgschaft_miete.pdf
    • http://tupesom.atwebpages.com/tapeworm_life_cycle.pdf
    • https://uploads.strikinglycdn.com/files/2dc6a63b-9085-4cc0-aead-eaef11ca6941/the_outsiders_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/cb2b2e96-8172-42e7-aad0-40a756e20814/95481503630.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f413.bin
03bd485b773ac8bcdb751efd4f68e259ee779469509747ac2a5aa56c85a3444a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 5292 bytes
font_01_sfnt_off00010615.bin
6c89985b6bccae1d285db2ab04e327804a88589c0a60628ad8026d4276d81c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 10844 bytes

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