Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef73ba92ac2b0dbe…

MALICIOUS

PDF

71.8 KB Created: 2021-03-24 13:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bc0912b84865d30bd33f27c66ad42db5 SHA-1: d3b1442f7b105f184b5e61a94702c239fecc4046 SHA-256: ef73ba92ac2b0dbefa865576b81a196dc18e84a77addc4ed314407867c618a7e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest this malicious intent. While no scripts were directly extracted, the PDF structure and link farm indicate a likely attempt to drive traffic to potentially harmful content, possibly as a precursor to further infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/award?keyword=pediatric+status+asthmaticus+pdf PDF link annotation
    • https://cdn.sqhk.co/kobewudojuvo/jd4jjdP/little_big_city_2_hack_apk_rexdl.pdfIn PDF document text
    • https://pudebotajiv.weebly.com/uploads/1/3/4/0/134012430/ab67a.pdfIn PDF document text
    • http://medicinfo.online/fiche_technique_ascenseur_otisz1xg8.pdfIn PDF document text
    • http://pokupka.space/302422012794ml40.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/h9hh9he/archer_cathro_julia.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/uBxRgdY/best_soccer_manager_games_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/WligIKU/move_whatsapp_to_ios_from_android.pdfIn PDF document text
    • https://nigupuwifiva.weebly.com/uploads/1/3/5/3/135329906/gejadafanizano_xikujitifod.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/dd5eabf568b6.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/qjgzihB/pibowizekasu.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/Yr1O9ch/27837442166.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/lazotukobi_sakuval.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/lkgjcmt/mimpi_ular_hijau_panjang.pdfIn PDF document text
    • http://tradestaroffice.com/rixejatuvobebefov39q.pdfIn PDF document text
    • http://detonicinitalia.website/35938864797g5mct.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/ZhaZlhb/shoot_bubble_fruit_splash_mod_apk.pdfIn PDF document text
    • http://kamini33.ru/the_book_of_five_rings_thomas_cleary9ycel.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/a401ea31-c433-41c2-9bd7-40e9c555fa0d/sinovejarevebelosemifif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865b710c-d582-4f05-8888-d0f888568e73/free_number_flashcards_1-20_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7863805-fc72-4856-9c0f-ebf281b3535f/63207086388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136beb6c-7380-41d2-972a-2a4290015f9d/why_is_it_so_important_for_antigone_to_bury_her_brother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42f8b1c-d4f5-4cf1-8d97-269d8a41dfdb/inkscape_ai_export_plugin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baaeafed-bcc5-42d8-af9f-fc407897da67/bakoparijitovejuwixek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d06523-05ae-4b0d-9d7e-f6bf210d49a5/xbox_360_remote_charging_station.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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 5364 bytes
SHA-256: 3e010facf0520a2e2e29902db84e0b5d7f2b0cea16741bf62f4083d7433b5be9
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10672 bytes
SHA-256: d4933492baf156ca7529a65e927c018b7b11f183fbbad07c012ca39b8fb8fa1c