Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e2e6b52c19b026…

MALICIOUS

PDF

84.0 KB Created: 2021-05-31 17:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b174f59f3ff69acb2d12731f42afd84 SHA-1: eed0e35b097a6ede20323d0242b66e759e96f9d8 SHA-256: 73e2e6b52c19b026afb5b11a447ca6d8d4558c95374984ce448b1ba5a2f835be
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 0.9967

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://leonvi.ru/123?utm_term=candidiasis+oral+pediatrica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423757/normal_601954a477f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_605d76a4e2d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fe985ba14e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475216/normal_5fd1ac3c48b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_5fdac6f311125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd67113d511f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4402740/normal_60b493ba89ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_60250d5cde9bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_6001085b77445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sepaxebi.pbworks.com/f/30059351831.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144414258/11836282807.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144416775/nenirufovekenibiz.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144414339/descargar_five_nights_in_anime_2_para_android_apk.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412821/stative_and_dynamic_verbs_exercises_multiple_choice.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/xugukewidinu.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/nifanesivurabago.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/63484349187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d590f1-dd5c-4aba-9a59-f73b1c4f8d11/73981956887.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/how_to_activate_g-shift_g502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d5f3a1-112a-4ff9-9611-7d097a4ee67c/cant_install_realtek_hd_audio_manager.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/how_to_consolidate_data_from_multiple_workbooks_in_excel_using_vba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da35ecde-138d-46dd-88cd-10b38c77b9fa/acer_aspire_v5-571_price_philippines.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412257/the_measure_of_man_and_woman_human_factors_in_design.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/solucionario_de_investigacin_de_operaciones_taha_9_edicion_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5dcda88-99f8-4581-8819-5f2860411bef/what_kind_of_battery_for_garage_door_keypad.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412629/tesepekukegoker.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144411600/the_ph_miracle.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_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 5052 bytes
SHA-256: 10ed5416e3d90e2b799ef1b3565233acf77bdf307cea2c30fc1313387bded74e
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 11712 bytes
SHA-256: 8026079127450418471f60d74f703b3a7bd830f629ac54a82b77953e7a4d6d8c