Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4341b59be4e63c…

MALICIOUS

PDF

75.2 KB Created: 2021-06-13 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 032309060d0eaeb6538c0dc09d7daf18 SHA-1: 2699bf07eacf41ed65b9b521c606b5b93f8ecae6 SHA-256: 7a4341b59be4e63c0df4db6756af65d8b76046024ea15da7c8fad15431d67b39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://jumiwimov.ru/123?utm_term=adventure+games+apk+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409098/normal_6050539009a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_60607b7b7c764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604458e3cd890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_60251d7d3520d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5febd6ffc8f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_60c2c0106a418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505125/normal_60535d15d1787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/taxugowasoxobudalufaguno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbca58b9-cbf3-46c6-a606-5818a99669d3/o_lord_our_god_how_majestic_is_your_name_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541e91ed-7dfa-43f9-b062-9a47d97a8abc/analisis_de_los_personajes_de_la_mascara_de_la_muerte_roja.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144487977/67723540121.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144870357/odysseyware_geometry_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0831ff7a-1b12-4111-8a29-3bf289ae22bb/les_miserables_movie_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b688697c-4fe8-473f-9510-a9a88f7923e9/royal_crest_room_kissimmee.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/w/file/fetch/144801549/where_to_get_a_passport_photo_taken_in_spokane.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144426669/zoriku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bf7b68-0c91-4cfc-94aa-ae20c054363e/hot_cross_buns_song_recorder_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8dc6ef-18a8-4c85-8f3f-d8eead9495cb/25526778911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07993c9-8f01-4c48-b747-4081e9b30744/yakima_roof_rack_near_me.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/145224396/luxel.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144827505/ejercicios_practicos_de_word_2016_avanzado.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/the_hunger_games_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36df8002-87d2-4858-b477-08ea96d10d44/toefl_writing_topics_and_model_essays.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 5444 bytes
SHA-256: a7def396f11124c88df1cc0c654c4941f9316322366dc432114856204d6ce109
font_01_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 1800 bytes
SHA-256: fe0844d8054473b268fa82887a9084f284c14e54d833d6ddeb0032e0dcdda13e
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 11328 bytes
SHA-256: 4d1edb8d5c83dce93437c04488028dbb593808a81e6280ab6e8d444c830f303d