Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7441bd22c12a72c…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 09:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73b310226f64815b77d450d7deb5db10 SHA-1: 71b7851cf5fb1da1921d62413e0403380570c076 SHA-256: c7441bd22c12a72c798c91860d68f654f5078d338c4240a012c9ceecf3c411c9
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics an exam timetable, a common lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site.

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://jumiwimov.ru/award?keyword=btelinx+exam+time+table+2020+pdf
    • https://cdn-cms.f-static.net/uploads/4414679/normal_603c7fc1c3b3b.pdf
    • http://nadugavuwitaleb.iblogger.org/black_and_decker_waffle_maker_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_601647175b7fa.pdf
    • https://cdn-cms.f-static.net/uploads/4384323/normal_603eccba50f3e.pdf
    • http://bexunorisomev.iblogger.org/what_order_to_read_warriors_books.pdf
    • https://cdn-cms.f-static.net/uploads/4497369/normal_604d82e30f62d.pdf
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5fee80473f8f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83b5ba1d-4a5c-4977-9705-babcaad4c638/kesetaw.pdf
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_0e1dd50c8f5e4497a09b783704a1ca2b.pdf?index=true
    • http://datatoxozapi.epizy.com/android_studio_preferences_shortcut.pdf
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_55a4c4dec34c43a3802d046e68c03233.pdf?index=true
    • http://gerobuzu.epizy.com/52586434324.pdf
    • http://vodulisus.rf.gd/after_20_years_o_henry.pdf
    • http://jofeliruf.rf.gd/caballo_de_troya_7_jj_benitez_gratis.pdf
    • https://uploads.strikinglycdn.com/files/edc6c759-d406-47a5-af7e-d29a12a7d884/72958249966.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_30e1eb24cec8441a9b3b859d003ec86f.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_06f91edfa0fd46db946637b710517b06.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcfb9531-a2d2-43d2-967a-e73016be7d79/57383661037.pdf
    • http://xuwanugadog.rf.gd/73744994175.pdf
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_9596b2c4a0974e7b9d61d22ca9edf710.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f8ba8dc9-b72f-4d12-af1e-361ad7a1e931/9430033648.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_off0000f7fe.bin
82585883233604e9357e3359c0e61a09179163003b950a60532033eb53e8fd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 5444 bytes
font_01_sfnt_off00010a7b.bin
0fb966bba6796a21340bc43236a36404f872463a3ffd0e58c6293d246f1438ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10972 bytes

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