Malicious PDF — malware analysis report

Static analysis result for SHA-256 9399a8f277d41e9b…

MALICIOUS

PDF

78.8 KB Created: 2021-03-25 00:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ea8476d649b2a949ff52c3a7a108d264 SHA-1: 5ecf8740286cb3ae4e162f5ec7970c892b50faee SHA-256: 9399a8f277d41e9b93c78e87340809a22db49384b75facc6a0a5cd84ed68a47f
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=wordly+wise+book+7+lesson+9+answers PDF link annotation
    • http://vowewudimo.mypressonline.com/mebofov.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/46333543075.pdfIn PDF document text
    • http://nizagose.66ghz.com/94111235980.pdfIn PDF document text
    • http://gomotejux.iblogger.org/65918926504.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/vubazolimuxem.pdfIn PDF document text
    • http://timedezalug.iblogger.org/badlapur_songs_pagalworld_320kbps.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/kejonekoratitiwifepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a898a06-5fe7-4447-8522-d438f2389189/bawagovogixalerefemefa.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/commercial_electric_multimeter_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/27188150443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763f0f99-a82e-47b5-8600-27d023fac568/p-touch_pt-1290_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f884efca-a860-416e-bba7-af567336475b/a_history_of_the_world_in_6_glasses_coke_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca04125-70ef-408b-bd65-7b70252cefed/1998_toyota_camry_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/writing_equations_in_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e2a662-1bd4-4e34-8408-a2646a496656/red_cross_cpr_certification_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/android_os_names_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bd8385-aef8-43c8-b97f-94d18ce1365f/hp_officejet_4500_printer_is_offline.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/how_much_do_environmental_health_and_safety_managers_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59012c4-053f-471b-b8f0-37f6904ff0a2/hp_pavilion_dv6_graphics_drivers_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/rifajovupuvekivakow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2690d2d3-abf7-4d1d-bca6-8778342c7906/how_to_speed_solve_a_3x3_rubiks_cube_cfop.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/go_math_5th_grade_workbook_online.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5464 bytes
SHA-256: 9696bd59f59dc499c3e5326db792bc2a8e07d7ada5b6280a564aa18169572fcf
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 11812 bytes
SHA-256: 6c396b0f93ca511b8a268ac42334bcb09872b6180727a99d54f8c64bf4371dbe