Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea751227b23b5897…

MALICIOUS

PDF

71.5 KB Created: 2021-04-05 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3693ecf11676dfe65aefec8b77c21bb6 SHA-1: 76187f7224618d47104526d5f0ff1a1fece74965 SHA-256: ea751227b23b5897f789f0683d92f82dc5e249cff0c97f83d2e9bd0aa74e4f5a
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or download further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'school crest template'. No scripts were extracted, but the presence of external URLs and the nature of the detection indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=school+crest+template
    • http://newsportstechnology.ru/kindle_paperwhite_instructions_for_dummiesfw6t4.pdf
    • http://pizolejotana.22web.org/qld_state_school_calendar_2020.pdf
    • http://kebotup.66ghz.com/asus_chromebook_c223na_manual.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://prizinsta.site/tizofila49ya3.pdf
    • http://vykupavto54.ru/wegawozuvemapitajiguxo97gee.pdf
    • http://raifaisentgo.online/bibinekenimapoxavomedcachw.pdf
    • http://like-store.site/konatenexo447yb.pdf
    • http://elinekici.online/cat_war_2_mod_2._212btq.pdf
    • http://laxana.ru/lokidedukx171.pdf
    • http://icub.tech/46732734558fno3j.pdf
    • http://dvertsoff.ru/relitakuwapenarizukkgo9o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/47fe158b-6fa3-4996-add9-1a4f22cd6844/what_is_the_benefit_of_a_deed_of_trust_loan.pdf
    • https://uploads.strikinglycdn.com/files/e06169c3-b596-4886-acea-3d01e26f62ab/bixewosowegopuvepe.pdf
    • https://uploads.strikinglycdn.com/files/074eed37-740e-4edb-9bc4-de907cbd5932/9495123482.pdf
    • https://uploads.strikinglycdn.com/files/79102f14-a4a8-4d0f-b87e-a3f3a6a0b5d7/tone_it_up_cinnamon_roll_protein_muffins.pdf
    • https://uploads.strikinglycdn.com/files/8176aed0-63d2-4c9a-815c-59cc0466949a/95815377741.pdf
    • https://uploads.strikinglycdn.com/files/38657d87-ff7a-4e25-ae3f-264978375f22/how_to_type_p_copyright_symbol_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/9c6b5a85-a780-4387-91ee-2eff53f358fc/93853090806.pdf
    • https://uploads.strikinglycdn.com/files/6a3d5c57-34f6-4fc3-999b-62843cd27a11/what_are_agile_project_management_skills.pdf
    • https://uploads.strikinglycdn.com/files/9b88fd26-8955-47df-ae44-6c09abcd6803/gakurexibevaxolumod.pdf
    • http://dowibisewapidon.rf.gd/l_adjectif_possessif_exercices.pdf
    • https://uploads.strikinglycdn.com/files/863458a4-d055-48f3-8562-8e15a1fc142a/49914540548.pdf
    • https://uploads.strikinglycdn.com/files/4e0ebec8-f9e7-41dd-ab87-1da2edef8ca8/huskee_lt4200_lawn_tractor.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_off0000db49.bin
32a0d20ccfafaf4c07e5fb494319498643604f971936a12e5c32ca347b6d4571		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 5276 bytes
font_01_sfnt_off0000ed09.bin
1fac038e93391eab9b5219182e6999fd08dfa2ab842ddf9fb30b81a177794d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10344 bytes

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