Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e780be28d85b5…

MALICIOUS

PDF

164.3 KB Created: 2021-04-29 14:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8f0ccbd9090a5d1bfceaf398f5d69a83 SHA-1: d84a37e94ca9339a93538c4248d06e9f6ad53ef2 SHA-256: 723e780be28d85b56e305b61afe6e908b930d5dc5ea707fd37833ac1a2d8d496
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_INVOICE_LURE' suggests the document is designed as a fake invoice or payment notification to trick the user. Although no scripts were extracted, the presence of embedded URLs, particularly 'https://xezojetit.ru/strik?utm_term=chapter+8+chemistry+barber+test', indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xezojetit.ru/strik?utm_term=chapter+8+chemistry+barber+test PDF link annotation
    • http://itdomen.fun/tenant_walk_through_checklist_bc0u8a0.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/how_to_build_a_homemade_ice_cream_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/haif0cN/costco_potstickers_ingredients.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/ca_dmv_driving_handbook.pdfIn PDF document text
    • http://salonop.xyz/32519294740ga08w.pdfIn PDF document text
    • http://wowitaly.space/the_walking_dead_our_world_beyond_cast5ly9m.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/dVhfghi/32990432343.pdfIn PDF document text
    • http://notdull-eng.online/bekudo044xi.pdfIn PDF document text
    • http://fajamad.mypressonline.com/indonesia_tourism_industry.pdfIn PDF document text
    • http://vknart.xyz/football_manager_ultra_2018xfmk5.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/879a34e5-5e03-4699-a3f4-fca9abaeb3a9/how_to_draw_a_komodo_dragon_step_by_step_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/when_did_they_stop_sacrificing_animals_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c362fa5-7ab5-49e2-b5d4-310d2743a7c0/how_long_do_i_cook_a_turkey_in_an_oster_roaster_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64fd08d-a88e-43e8-8f76-a84ed07bda51/borabunowanugagipagoto.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_06663c6073b54282baff83a9dc1b6857.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_714103201b0b44c19c8a100328def9c5.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_9a9373c1cd87400a83138bc7d90d9a57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufupu/exercise_3_sentence_completion_lesson_16_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/xikawexoxexu.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/rama_judicial_consulta_de_estados_electronicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9261087-da4a-4e47-9aee-796f7795d8e7/what_is_the_highest_rank_in_one_punch_man.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/viruses_bacteria_and_your_health_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28aa990-b6ea-4587-915f-64efa5c22976/55840468898.pdfIn PDF document text
    • http://defakulid.atwebpages.com/dd_starter_guide.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_off00024992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24992 5480 bytes
SHA-256: 4fe86d73f8ddc40be7facee2a66dee8dee3158a7a06dc0dcff241657894709cc
font_01_sfnt_off00025c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C08 11448 bytes
SHA-256: 61794065d0ed6b73ed0855226ba32f4180b3868daa5e1c0a6032c74634df2414