Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0606c7099bb6ff…

MALICIOUS

PDF

74.0 KB Created: 2021-06-13 23:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a2e0e1263f1f2d41a5ecf6f19f11862f SHA-1: e53eb86738e79afe697da7d9085ac668c68e8b9b SHA-256: 3c0606c7099bb6ff7fd21e0e075cbe7e45adfc3853a3239ed94c60e6aeee30db
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'https://inwebjor.ru/pbw'. The PDF also functions as a link farm, suggesting an attempt to direct users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=boris+et+natacha+partition PDF link annotation
    • http://www.les2rives.caIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letekejafo.pbworks.com/f/67754110677.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/download_ppsspp_gold_for_pc_free.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/borezirujubinavajaxakazoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92e6d0c-79d8-4544-bb1c-176b3eb5e213/do_all_snap_on_tools_have_a_lifetime_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4076f72f-ac57-4506-ae20-0dbf224e0848/jujemaroked.pdfIn PDF document text
    • http://kosubufegu.pbworks.com/w/file/fetch/144678651/what_does_account_information_disputed_by_consumer_meets_fcra_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a635633-27ca-4195-bbb5-495a04b6ea7a/what_is_.net_clr_version_in_iis.pdfIn PDF document text
    • http://dibotoge.pbworks.com/f/dnd_5e_premade_character_sheets.pdfIn PDF document text
    • http://gaguseka.pbworks.com/w/file/fetch/144642039/foratimufiwid.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/what_causes_tectonic_plates_to_move_over_the_surface_of_the_asthenosphere.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144459435/pokemon_go_apk_mod_joystick_2020.pdfIn PDF document text
    • http://rivikixizub.pbworks.com/f/convertir_to_word_candy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a885dbd-a4b0-4b21-ba59-70dad7efc3fe/95999597353.pdfIn PDF document text
    • http://veputuvus.pbworks.com/w/file/fetch/145210002/kuvivivedijuxade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff5f052-3733-4f79-a93b-a7c51964c51b/gamovamerarotoforitogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8017f58c-5ea7-421e-9552-a4d8bb09f3af/game_of_thrones_box_set_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2172d677-fe01-476f-a48b-37649ac130d1/7_2_skills_practice_similar_polygons_answers_with_work_form_k.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144477693/62137062941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c34d0b-d29e-40b0-a325-0af82564ac70/sarokekanuxanowuj.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/belulefasavefanosata.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144609999/gafasivusasevanipob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c63efd6-8cec-4a62-afc5-80c80f77720a/73630339114.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/f/78226910445.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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 5040 bytes
SHA-256: fea255d6513107fd58e74284eb6999740971541f83b54a3bda088776a04caaaa
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 13072 bytes
SHA-256: 4998816e27a5e613afba995ba2083b38dc4086b445ab189499ddbaa453fe3bd8