Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2d19f7bf94c674…

MALICIOUS

PDF

76.3 KB Created: 2021-05-06 10:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0574f2304d613f6a5b0ba14819fcfb77 SHA-1: 4a3814e337e08aecb634e7ec5dd8e2d3d87f8e93 SHA-256: 2b2d19f7bf94c6743aa4bdf8f5b07c930d36b712643c9dc1a02b920ad21a1eed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests an attempt to distribute malicious content or manipulate search engine results.

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 http://kirudikegopoded.sportsontheweb.net/35881724405.pdf In PDF document text
    • http://ttop-shop.com/do_payday_loans_go_to_collectionsvfixq.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/venogevifi.pdfIn PDF document text
    • http://magnitoli-2ekran.site/marantec_garage_door_opener_battery_backupp0yu4.pdfIn PDF document text
    • http://dmdmassage.com/six_way_paragraphs_introductory_level_answer_key6fmep.pdfIn PDF document text
    • http://copyrightsupporteds.com/summer_infant_monitor_wont_synctm4dm.pdfIn PDF document text
    • http://kleomaften.online/walotutamedugaxuxeye0k4.pdfIn PDF document text
    • http://goods-amzon.com/words_their_way_onlinevo6xy.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/surah_abasa_download.pdfIn PDF document text
    • http://inter-kalinka.ru/67597384493z3d8m.pdfIn PDF document text
    • http://7gusevshop.website/xupugafegcyqj5.pdfIn PDF document text
    • http://theplafond.xyz/korean_language_learning_books_free8yw5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=what%20does%20pe%20error%20mean%20on%20lg%20washing%20machinePDF link annotation
    • http://nobudusoselazo.epizy.com/critiquing_research_reports_in_nursing.pdfIn PDF document text
    • http://jufogitomob.onlinewebshop.net/end_of_6th_grade_math_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700a902d-5cf3-4e1f-ad47-f67481569854/36897063728.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_d0274c4faf1548b8acfecde5130e3b2c.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_518408dc8b044f8fa4cbfbaa0e676395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cf50f6-1bcc-417e-a293-61889f26caeb/page_67_big_book_of_alcoholics_anonymous.pdfIn PDF document text
    • http://relegutewaxo.epizy.com/12688906603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8571eb6-9b07-4047-a0f1-07ddfdbc22cb/walls_of_babylon_lyrics.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/rokivavepuxikovofiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0552d3c3-df61-4058-a76e-283539ed5113/lomobemenodef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c49f2df-c011-408e-af71-d84421adbefa/how_to_find_the_isosceles_triangle.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_147f96e9111e4911925413e1362a508d.pdf?index=trueIn PDF document text
    • http://lafojagifod.epizy.com/bupuvogozixalavuxog.pdfIn PDF document text
    • http://putojeferef.rf.gd/dumitaxulofopukiju.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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 5592 bytes
SHA-256: 98808225793a6f8b35dca6f102002aa48cd1799cc447f7c914f1f06dc34112e6
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10608 bytes
SHA-256: e42243ae8e0cfcb1cfd13b1a151fb3699770ae356ee38e7f8e7f47fb2a083aed