Malicious PDF — malware analysis report

Static analysis result for SHA-256 459e27a0c1650770…

MALICIOUS

PDF

80.3 KB Created: 2021-04-01 08:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa8751ebc0b63998bbd61019c7fd3af SHA-1: 9cf7866af28e68b10c44579e77631cf6d3339c7c SHA-256: 459e27a0c1650770651891082d8a42356a709d137304870a09713c77afa088cb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a heuristic indicating a fake CAPTCHA, suggesting a social engineering lure to trick the user. The embedded URL points to a domain associated with phishing or malware distribution, likely serving as a lure for credential harvesting or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://fokemale.ru/strik?utm_term=how+do+i+change+my+voicemail+password+on+my+tracfone
    • https://cdn.sqhk.co/jinubodilev/havjijj/dual_monitor_setup_hdmi.pdf
    • http://toportt.online/nozubiwisifufexadatemek40jv9.pdf
    • http://zootime.store/event_promo_free_templater0qx0.pdf
    • https://cdn.sqhk.co/xoradofexul/hdVihC3/hyperspin_hard_drive_review.pdf
    • https://cdn.sqhk.co/munakuvu/0dzVjab/didirazegevumuxuzarifat.pdf
    • http://insitemonitoring.com/4938886202gzb4b.pdf
    • http://raisinsapp.club/87783974810nbair.pdf
    • http://discount50it.pro/5936482821684oy9.pdf
    • http://trujillostacoshop.com/xulujovipupukudilqx9qh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xipavir/wilirexiburogamotakolofos.pdf
    • https://uploads.strikinglycdn.com/files/203e4376-9050-4db1-be70-976e9e2a8460/how_to_calculate_geometric_probability.pdf
    • https://uploads.strikinglycdn.com/files/cb0167c2-f299-4706-bbe7-dc791f6acc3e/what_kind_of_charging_cord_for_kindle.pdf
    • https://uploads.strikinglycdn.com/files/b168b8c0-7a70-499b-80d1-e95d299604fc/why_is_my_rv_refrigerator_not_working.pdf
    • https://uploads.strikinglycdn.com/files/81d92b15-e9dc-41f0-ab52-a7dbef11805a/80553482590.pdf
    • https://uploads.strikinglycdn.com/files/482654ee-bc07-4e19-a301-a360d2dc387e/2008_dodge_ram_5.7_fuel_pump_relay_location.pdf
    • https://uploads.strikinglycdn.com/files/240fc13c-cc41-48b0-8798-d14cc9519c68/shakespeare_julius_caesar_cassius_speech.pdf
    • https://uploads.strikinglycdn.com/files/55a91a07-d1e6-4f26-98c4-1fdf4772afda/diccionario_biblico_cristiano_para_descargar_gratis.pdf
    • https://uploads.strikinglycdn.com/files/51b8c6f3-e201-4428-aa45-4d2abfbee820/twilight_graphic_novel_volume_2.pdf
    • https://s3.amazonaws.com/xezonijida/volume_of_cubes_and_cuboids_worksheet.pdf
    • https://s3.amazonaws.com/suzujewa/3921336723.pdf
    • https://uploads.strikinglycdn.com/files/7fa0c58f-a453-44a3-a582-58e80f594d19/72613951274.pdf
    • https://uploads.strikinglycdn.com/files/96bf14b8-045f-41ab-abdb-dd5bc97b74c5/mechanical_engineering_internships_nyc_summer_2019.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_off0000fa54.bin
e0f78898133a5675d32836c5ae26b0a24aa582c5afd67a7bd2b26a9d29cd693a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 5784 bytes
font_01_sfnt_off00010df9.bin
45d027e22dd094e7afdd8aa9e686b3e19b53dabe899e45802196c1f0c5d9efc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 10972 bytes

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