Malicious PDF — malware analysis report

Static analysis result for SHA-256 81feeb07e3943e3f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-31 00:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18bb8c310594868751605c594ece8f03 SHA-1: 0884a7b2e57eae6d11201dab4bcdec442fc8f156 SHA-256: 81feeb07e3943e3fa20602f6f7209df56c391e8f93379028de448e9330efe56c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'syllabus'. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=mahadiscom+assistant+engineer+syllabus+pdf
    • https://cdn.sqhk.co/votojuxosaf/Rrk4jiJ/starlink_battle_for_atlas_ships_list.pdf
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ffd1cff27296.pdf
    • https://cdn-cms.f-static.net/uploads/4475379/normal_604495c5d8e7f.pdf
    • https://cdn.sqhk.co/rorajakura/ajgjjgi/pesowemilofemixevutu.pdf
    • http://wovuwukotuvoxi.mygamesonline.org/strength_training_exercises.pdf
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5ffa2e4db6df2.pdf
    • http://vetobiz.sportsontheweb.net/definition_of_communication_by_scholars.pdf
    • https://cdn.sqhk.co/leporolino/ifmLPyR/vuvuweme.pdf
    • https://cdn.sqhk.co/puzadowoke/id6hggd/demetrios_chapter_2_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sadozejeko.myartsonline.com/logo_quiz_world_answers_level_2.pdf
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_94135325a16b41e8b356bde6dfcb4059.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_21bf7870114a4e1fbe5ec8594edf5124.pdf?index=true
    • https://s3.amazonaws.com/wopari/basketball_offense_plays_against_3-2_zone.pdf
    • http://foduxidepozipiw.myartsonline.com/mcdonald_s_canada_menu.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_0ba0a5a8de7d4ab7b771b5c557e2e6ca.pdf?index=true
    • https://s3.amazonaws.com/fibesezati/68001901546.pdf
    • https://s3.amazonaws.com/poresi/gusurozibubimuvuviwoxulom.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_2acdc8d831974768a99db6bb71c7dc0b.pdf?index=true
    • https://s3.amazonaws.com/bezorito/19312011738.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_off0000f79c.bin
22d9c3fee05fc40502277177a8122b9072284a9592cfff61b9508c83c9fa482d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 5816 bytes
font_01_sfnt_off00010b53.bin
17aca2097a735cece83323615e541a9777a169a9c2c0b699362e3607a04f8fa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10876 bytes