Malicious PDF — malware analysis report

Static analysis result for SHA-256 de986028b8c9cda0…

MALICIOUS

PDF

83.0 KB Created: 2021-05-12 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 725a3d38ddec5a0daac920c52d4b67df SHA-1: 728784debf5915affa074cab56717debfaedf374 SHA-256: de986028b8c9cda0eb6ccb680675e57e782cc6ab3692b7525ff9b9a5602b46e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=audio+driver+windows+7+32+bit+intel PDF link annotation
    • https://cdn.sqhk.co/levowexesu/i2haicy/head_basketball_championship_hacked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602b73e439952.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/32547838383.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/physical_appearance_vocabulary_elementary.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/jd34C5t/block_fortress_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/ggOgdia/plasma_live_wallpaper_free_download_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/CUhegjr/99756167528.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/7viiijo/beer_pong_table_diy_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_606b5739f3db6.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/xozijenomoruku.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/9705b47a-f569-4c24-a1bf-5a459bbc6679/43724145976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fdfe9f-4aa4-43d7-947c-d5875e666e14/philosophy_here_and_now_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc61e6fb-cf46-4dcd-9594-d3d1e98f8f2a/bakoxetebezusanawose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c22969b-b88c-47ac-8935-41a510b3defd/91554383849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44586f14-2934-4d23-99ff-6249e16aaa71/seinfeld_the_apology_gregg.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/how_do_i_connect_my_hp_officejet_j4680_to_wireless_network.pdfIn PDF document text
    • http://kopolug.myartsonline.com/xojijurefiwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4242f8c-bef2-4185-b9df-9e8a6cab1eac/88213198703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e192b24-330d-4914-9812-484edbe0f3c1/kiwuxixalizakulopirup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9d2fe0-45e3-4ac1-9ac4-9d9ab195e3d1/asus_rog_crosshair_vii_hero_bios_update_ohne_cpu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da819a1f-cd50-4ff3-b1e8-dca9e813c8b8/how_much_do_district_attorneys_make_in_los_angeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce832c4-932f-4a69-9093-23a926a6fcab/youtube_how_to_crochet_baby_booties_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231a2443-f601-47af-85c9-722afbae742c/how_to_draw_cool_stuff_and_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17dd0096-ce1f-4f22-a65b-f5a1283ff092/why_does_my_head_hurt_on_top_when_i_touch_it.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_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 5268 bytes
SHA-256: cff5ecb274efbc275d1a2ff921ac6104057f92fafcae37fd895d2c2b0b10b450
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 10752 bytes
SHA-256: 234e72d7edaf496b7d1e45851f21067cc86393a773d4ed87a60637c40936648b