Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a89a509a3e86d21…

MALICIOUS

PDF

79.6 KB Created: 2021-04-05 16:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9c2b5ae6396e8a907549b748d1f74b3a SHA-1: 4207def2190c9ce0ba0c5438b8bd935dce412720 SHA-256: 9a89a509a3e86d2147259d674aa30e1cf6f6539ef6447a15f4eeb7c607d52b16
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms. The ML classifier strongly indicates maliciousness. The document body, though obfuscated, appears to be a lure related to a movie quote, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://druttle.ru/strik?utm_term=ned+vizzini+it%2527s+kind+of+a+funny+story+quotes PDF link annotation
    • http://nutopul.22web.org/61250687293.pdfIn PDF document text
    • http://cashbackmoney.info/genie_intellicode_remote_resetvqv5x.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/pY4hbgj/new_craftsman_tools_review.pdfIn PDF document text
    • http://about-fb-support.com/tudumowytou.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/ieejaN9/muruki.pdfIn PDF document text
    • http://lorenbayi.com/59776055953zoynn.pdfIn PDF document text
    • http://gojodefigogizib.iblogger.org/the_birds_and_the_bees_talk_story.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/0HSjjjj/country_life_harvest_day_mod_apk_revdl.pdfIn PDF document text
    • http://pe50off.info/how_do_i_setup_a_wireless_n_repeaterw4426.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/hzxXKhb/58343733530.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/vQijgcO/health_and_nutrition_degree_online.pdfIn PDF document text
    • http://wotodusasesode.iblogger.org/system_effectiveness_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazisuj.epizy.com/zasetati.pdfIn PDF document text
    • http://dabevejef.rf.gd/91967803821.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/xirinekuve.pdfIn PDF document text
    • http://dizoran.epizy.com/wedding_ceremony_template_pinterest.pdfIn PDF document text
    • http://damokoz.epizy.com/19124766533.pdfIn PDF document text
    • http://duximamezuzef.rf.gd/how_much_does_a_napoleon_furnace_cost.pdfIn PDF document text
    • http://kajurilin.rf.gd/mujakufidojesomesakaras.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/how_to_learn_visual_basic_online.pdfIn PDF document text
    • http://migusopugaj.epizy.com/curriculum_development_in_nursing_process_and_innovation.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/vampire_diaries_season_3_episode_10_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/pet_animals_hd_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/acer_atheros_wireless_driver.pdfIn PDF document text
    • http://gefotuja.rf.gd/lds_hymn_come_thou_fount_sheet_music.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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 5272 bytes
SHA-256: 3a722a91a13ba1c3f3302cc26674d4540161b32911f109eaf1292a4615236482
font_01_sfnt_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 11412 bytes
SHA-256: fe4951b6c5b78c3ed2002b42d16da6ada9456f42c89ac6747069539968abefc8

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