Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc85e47f9ccc0f0…

MALICIOUS

PDF

102.2 KB Created: 2021-04-07 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b7f5298d85b02dff20a917f0f9a5515 SHA-1: b19e2dd7e54fd76dfe038353336ea9cb6f5db52f SHA-256: 5dc85e47f9ccc0f088931e4fc36f40dec5557e07064cfa946acf77cb684844a2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external links, suggesting it is part of a link farm designed to drive traffic to malicious sites. The document's content, though heavily obfuscated, appears to be a lure related to educational worksheets, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/wix?keyword=volume+compound+shapes+worksheet+answer+key
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/poxivoluvumoza.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • https://cdn.sqhk.co/babakobesuxe/CIgfg0N/manifitakaxadepowegape.pdf
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/pomuwijexa.pdf
    • https://jomigivava.weebly.com/uploads/1/3/5/3/135330213/vikukanen.pdf
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/doxigudazose.pdf
    • http://kittyplay.online/27899624942szos7.pdf
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/naxizup.pdf
    • https://cdn.sqhk.co/gederanew/g4gjjiX/stickman_fighter_epic_battle_crazy_games.pdf
    • https://cdn.sqhk.co/difigobon/8W1hgZB/light_purple_room_decor_ideas.pdf
    • http://copyrightsupport-ig.com/12985998219g5n63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_c534ff0bff544636bb28c307ea30d645.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_3877e085e01242408a00d11fbfffcd79.pdf?index=true
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_3b6a25a6fdb0452a909b349cfb1034f9.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_91c000d8829c470d8c02c7b711b470c3.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_3d632a95dca64dd1a02ef7db459653fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/72d3c924-9ae2-4229-a322-b1a0d41b9dbd/d_link_dap_1360_user_password.pdf
    • https://uploads.strikinglycdn.com/files/a0313e89-877e-4d93-ba6d-b0be780425f5/what_size_wiper_blades_for_2017_rav4.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_59bbf48bab874a578377c900117f9935.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_2f84678accf84fe7adc6dcaed668205c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0f29507-4abb-420b-b398-3e41af2a60d4/wesuju.pdf
    • https://uploads.strikinglycdn.com/files/6c2e5dda-8755-4783-81b4-36b3f04ae357/east_taylor_twp_pa.pdf
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_83c46c819b9b4e85a3fe20556e388ff5.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_3a56a3c227e14273a87ab188c84cb671.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_off0001391a.bin
8f680b79a6a7cbdd43915e5c451ccb7183439ce14c3e8cefca735961929b2add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 5536 bytes
font_01_sfnt_off00014bdb.bin
6c4fa710f244d068bc46d1bc6096b3cafef56ff563b67de6ab455bd54dd91513		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDB 12480 bytes
font_02_sfnt_off00017623.bin
37f3561c453ff64f10df1907370face161e83361081c68d7b8be63159843aa8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17623 16120 bytes

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