Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce4ed3038f00a4…

MALICIOUS

PDF

68.0 KB Created: 2021-03-24 04:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca9c5df8b8a3e36e992675b81b7da934 SHA-1: 685f2fa4d06992a1a6fa7a99229a6b2b5155495b SHA-256: 81ce4ed3038f00a47a77709c1e16f8f0b3ef035efb81679741cfc54c12703dbc
136 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a lure for a game. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The presence of an external URI and the 'Password-protected archive lure' heuristic suggest the document is designed to trick the user into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://midufefew.ru/wix?keyword=motocross+nitro+unblocked
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/vejasi-komawukodi-nanora-pidutasigaxen.pdf
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/08b3e.pdf
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/zanubazivelaw_xerixi.pdf
    • http://pivolirarorip.mypressonline.com/how_many_tournaments_on_the_european_tour.pdf
    • http://tusiteguluvora.getenjoyment.net/zopelopafira.pdf
    • http://vetobiz.sportsontheweb.net/what_is_the_default_username_and_password_for_a_hitron_router.pdf
    • http://tunewejewuz.mypressonline.com/15574861389.pdf
    • http://virujurarajilef.getenjoyment.net/47935246158.pdf
    • http://sumapewub.getenjoyment.net/how_to_restore_yuntab_tablet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_a3d03b951c4648fa9e323b641cb1d179.pdf?index=true
    • http://doboroguvenuv.epizy.com/smart_vpn_client_draytek_android.pdf
    • https://s3.amazonaws.com/napisakaluja/google_assistant_apk_android_free.pdf
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_0a1b435d31de412d90034df534bfa7e1.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_c06c456bf36344ebbd6cb122fa4205de.pdf?index=true
    • https://s3.amazonaws.com/zufojadibi/nana_acheampong_songs_free.pdf
    • http://texomonimumoxeb.rf.gd/andhra_bank_internet_banking_application_form.pdf
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_3239f16092c4490ba8c4b2faadb63eaf.pdf?index=true
    • https://s3.amazonaws.com/solonebosop/personal_business_card_template.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_b264035a6d22433a9d2c36468aab5451.pdf?index=true
    • https://s3.amazonaws.com/legenapi/filmora_scrn_full_version.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_off0000cf28.bin
61add3911fb6d7dab5360e433dfabc415521e81eaa992da10e17f08baf72e9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 4932 bytes
font_01_sfnt_off0000e004.bin
616da266bfca468652a64f54e3a715baf14022818d3faa690ae2eb8c2f5cc802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 10184 bytes

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