Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2da367b598b9b1…

MALICIOUS

PDF

83.3 KB Created: 2021-03-17 08:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55798ac5a642ceff23a5c72c996315cd SHA-1: da18b17cfa2194c74b9968ce5a39a3719d1654e2 SHA-256: 3b2da367b598b9b1838eb0fcbcdc0953ed9975dcb2cd75108f6ae67ba2d56078
146 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/wix?keyword=bench+press+world+record+by+age PDF link annotation
    • https://cdn.sqhk.co/kigaratak/GoazZhd/airport_scanner_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/qgezGnr/weed_killer_spray_for_lawns.pdfIn PDF document text
    • https://cdn.sqhk.co/molofagaji/Tqtjthd/lock_out_tag_out_procedure_template_uk.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/airbnb_first_pitch_deck.pdfIn PDF document text
    • http://kogikisarazomel.22web.org/bose_universal_remote_not_working_with_samsung_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/2ifXxih/cat_running_away_from_home.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/3lwZijV/marxism_in_american_schools.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/jaAiejg/weather_forecast_gurgaon_today_hourly.pdfIn PDF document text
    • https://cdn.sqhk.co/sologavabo/jhshjbR/remix_omg_dolls_names.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/weight_training_for_weight_loss_plan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibejobumo.rf.gd/netacad_final_exam_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9faeda-6395-4c32-9b68-a10473b39684/what_do_you_need_to_renew_your_license_in_ms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98e0a95-093d-41db-b156-9939a8e6f523/insinkerator_badger_5_manual_reset.pdfIn PDF document text
    • http://zisekajoreva.epizy.com/voluntary_acknowledgment_of_paternity_form_colorado.pdfIn PDF document text
    • http://vujofif.epizy.com/beyond_two_souls_platinum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/lekavikuzumopinenanegaraj.pdfIn PDF document text
    • http://duxuramubot.epizy.com/story_elements_worksheets_8th_grade.pdfIn PDF document text
    • http://kukobim.epizy.com/document_analysis_the_mayflower_compact_worksheet_answers.pdfIn PDF document text
    • http://lusitenaburasow.epizy.com/final_fantasy_xv_a_new_empire_event_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b37f4a6-09f3-4e83-bfe8-206f331cfe86/minimimig.pdfIn PDF document text
    • http://kileduf.epizy.com/alantakun_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/32842703143.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_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 5720 bytes
SHA-256: a9652219e272a4bc3e3309387eb9dc4d28a489b6585b5e8d4d17b369e988027e
font_01_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 11216 bytes
SHA-256: 844e5a90fc2558e9e0facca5fa091bef7949f46572c54a88118995eadf7342af