Malicious PDF — malware analysis report

Static analysis result for SHA-256 897a01ac11793c0e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 15:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad8e0f5d6ad35803c3c378dc3d776699 SHA-1: 295fb1549fd047181e18b68b11a116b9cfffa99e SHA-256: 897a01ac11793c0efe2f17615554377942596c9a44a4651e3dc38579e8deab42
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://nipisod.ru/award?keyword=nauka+angielskiego+chomikuj+pdf PDF link annotation
    • http://stylecurtains.com/59335568016t86wg.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/cFUghhh/roseximixodumewivezu.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/y2igoA0/pigitezisugo.pdfIn PDF document text
    • http://pushbiz.fun/cydia_android_lock5huga.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/igpLjeM/village_city_island_simulation_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/hjkgegc/hospital_infection_control_guidelines_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/8CPrcih/hocus_pocus_witch_house_tour.pdfIn PDF document text
    • http://f1l3download.site/black_and_decker_spcm1936_cordless_electric_lawn_mower_36v_battery_chargerg1zv3.pdfIn PDF document text
    • http://prostotit.site/zutav2xcgm.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/uhcZgev/fill_in_3d_game.pdfIn PDF document text
    • http://smartycredit.info/67635296073rlc05.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/dhghbgf/6781345722.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/98029731-e31b-4fea-a408-45ae3d8f6f8c/what_is_io_in_computer_programming.pdfIn PDF document text
    • http://belevenefinul.epizy.com/panelview_plus_1000_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529450f8-b6f3-4f41-bb79-1161fc6f90b5/carry_on_size_limit_southwest.pdfIn PDF document text
    • http://vomemozasaz.rf.gd/how_to_draw_3d_things_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35280cca-6b8f-4f43-8c82-6c6d7b178d87/what_does_lets_chalk_it_up_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba73692-7ac0-4907-80f2-0c3fda0eee2c/jupujazolonabalitopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05bf5af-fd95-4178-86ac-2e31505d68a8/2_nephi_15_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1053b538-a77b-46ac-a8bf-caae7c4dcdb1/50041941959.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/sojarisilomefavarobomosep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d867267-66fa-46dc-8058-45d21fcbcfba/welojitodinugovisejuwedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa62a38-1bca-4db3-afdd-58c8b54314b0/momeziwuzuvedogawenab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa408718-488c-46c0-8a46-a76e8c8e331d/ronco_187-04_electric_food_dehydrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a40bd05-2e73-4ab7-8ec6-79eaa703d9b0/alcohol_distillation_process_wiki.pdfIn PDF document text
    • http://xizoxenefodage.epizy.com/posowafu.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 5584 bytes
SHA-256: ae256e41750c972db1d4506b1018e57c34139b2d7fb8b5934cec3834e02d0a29
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10728 bytes
SHA-256: c005f2083a5666268b4be7ac5ef795356d665ad6e3b47919f11d06b797a41e89