Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bf64331c6393f5…

MALICIOUS

PDF

74.0 KB Created: 2021-04-19 06:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095188074fb2a4f631707e1595c06a01 SHA-1: dc2c6aea857a2c6b4b380eaeef273b070a2d9e7a SHA-256: 99bf64331c6393f5dee3cdefd24b2716e1e71b05c8a75b20c7bec036faf35e64
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded URLs and heuristic firings indicating malicious intent, specifically related to phishing and potential exploitation. The ML classifier and ClamAV detection strongly suggest maliciousness. The presence of 'cmd' in the document body, alongside external URLs, points towards an attempt to trick the user into executing commands or downloading further payloads, likely via a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://resalured.ru/strik?utm_term=how+to+echo+variable+in+cmd
    • http://xazixovabifin.medianewsonline.com/usa_state_abbreviation_list.pdf
    • https://cdn-cms.f-static.net/uploads/4464080/normal_603929339228a.pdf
    • http://vumogegotawugub.mypressonline.com/how_to_lubricate_a_sole_treadmill.pdf
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6018e73e7a4e5.pdf
    • http://zomaragexavope.sportsontheweb.net/split_merge_files_software_free_download.pdf
    • http://kudukudimox.sportsontheweb.net/ceramic_materials.pdf
    • http://nebatomefov.scienceontheweb.net/fajafonedalalumoriwu.pdf
    • http://gadivawiw.sportsontheweb.net/vavisogiz.pdf
    • http://zuzatew.medianewsonline.com/student_attendance_form.pdf
    • http://didazema.mypressonline.com/telling_yourself_the_truth_audiobook.pdf
    • http://gopusoduj.mygamesonline.org/veterinary_clinical_pharmacology.pdf
    • http://javaxirivibewi.mygamesonline.org/catalogue_schneider_2020_en_francais.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xubibufopude.epizy.com/happn_app_for_windows_10.pdf
    • http://mimenevav.epizy.com/73647037212.pdf
    • https://uploads.strikinglycdn.com/files/562da665-ac27-4839-b85c-3eedd86aa7c3/canon_pixma_ip_9000_driver_download.pdf
    • http://jisijuvod.myartsonline.com/38681722692.pdf
    • https://uploads.strikinglycdn.com/files/8612ee34-f0ac-42c4-93db-a4ffad2f9603/novefarasovozurapowanapu.pdf
    • https://uploads.strikinglycdn.com/files/2985dc12-302f-4e04-8481-40251fd4e448/solubility_problems_chemistry.pdf
    • http://tobikinos.onlinewebshop.net/what_is_the_message_of_the_miracle_worker.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_off0000e0f9.bin
befa3e394efa146540f69c9d9b176d9954f3625ddfc5014b4cffc5eb5fbfc3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 5256 bytes
font_01_sfnt_off0000f2bd.bin
d42b0ee9db1154ffdd7ba80b54c8d5b18368593d4bd1a1eb7d3747872a468ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 11572 bytes

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