Malicious PDF — malware analysis report

Static analysis result for SHA-256 98288dfc63137471…

MALICIOUS

PDF

71.2 KB Created: 2021-06-07 14:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 407afc16631e891c834ca3b872a7068b SHA-1: ca79beb896568f47667f169b8429772a3d48d09b SHA-256: 98288dfc6313747133492c38400f4c61ac25d9f0020bc5c7472de2d193e070d3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'allytemp.ru', suggesting it's designed to redirect users to a potentially malicious site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm intended to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://allytemp.ru/pbw?utm_term=cuadernillo+de+actividades+para+ni%25C3%25B1os+de+preescolar+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fcda0ec8c67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_5fd850d2d4407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fff68902b671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_6026086c9bfac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408355/normal_5fe5c3602c16c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4411696/normal_60b06530c4af9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kesowununak.pbworks.com/f/avivanos_marcos_barrientos_letra_y_acordes.pdfIn PDF document text
    • http://fesatisobif.pbworks.com/w/file/fetch/144716325/speak_well_english_book_in_marathi_free_download.pdfIn PDF document text
    • http://mujiwareneje.pbworks.com/f/best_stroller_car_seat_combo_2021.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/45942258508.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/the_nutcracker_dance_of_the_sugar_plum_fairy_piano_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10de4009-299c-44fc-a302-f130643bc02c/wizibimufoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e04387-662b-47f2-a26a-4032c6fd3032/when_is_diary_of_a_wimpy_kid_wrecking_ball_released.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92cf79ba-7bcd-4289-9b3d-48cfd1a5c34f/how_to_repair_gas_oven_knob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6e46a4-6bce-4005-911c-738db782b783/why_does_my_hot_water_heater_keep_leaking.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/wifi_password_hacker_apk_100_working_for_pc.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/how_to_install_magisk_manager_on_rooted_device.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5448f02-b16d-47c2-b8cf-8372cd5cbe59/gosixajex.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144567699/generative_adversarial_networks_with_python_download.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/57051225860.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/ninosarazedupufokinuzava.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 5460 bytes
SHA-256: 1f8c3ce5bbf2f2b55f40bfd82fb077897e59eb5c13e241cdb608f520c950127f
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10888 bytes
SHA-256: 071e947ebcb1011abff3d84ddb62300ae0519ce8292624a7b6c87521f2d12ddd
font_02_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71