Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3a7cfcc6c64b32…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 12:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3950a7acf99b17a20441cef55981c977 SHA-1: c95eb6705e0ed8af7542cc372adb6a57b05fee88 SHA-256: 4c3a7cfcc6c64b321d1117c9ce1447a178378bc2620ba18c8010536546786ae0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain (`soxebez.ru`) that is likely used for distributing malicious content or phishing. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://soxebez.ru/123?utm_term=birthday+wishes+for+friend+free PDF link annotation
    • https://cdn.sqhk.co/wexazaruko/jdZNhdG/nogepiloxibowuminifubifo.pdfIn PDF document text
    • http://tipipunir.iblogger.org/nonprofit_organization_bylaws.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/AhcEKbD/how_to_play_chess_really_well.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/j51Rhck/4gb_ram_pc_games_list_2020.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/ecological_disaster.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/iiijbha/cruise_deals_2021_alaska.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/jebieie/samsung_australia_complaints_email_address.pdfIn PDF document text
    • http://bezanaralizeke.iblogger.org/tazewowuratuv.pdfIn PDF document text
    • http://refoveser.22web.org/cadena_de_valor_definicion.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/77781170909.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/arusha_accords_rwanda.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/2f68cb1b-2e17-45ca-9866-26470ee1182c/dapple_dachshund_puppies_for_sale_southern_california.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/k53_learners_test_questions_and_answers_2019.pdfIn PDF document text
    • http://xofawuriduk.epizy.com/zudexe.pdfIn PDF document text
    • http://degedudu.rf.gd/canara_bank_syllabus_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f03104-236a-4c9d-aa9a-e5b01b616e6b/is_it_ok_to_take_a_nap_with_contacts_in.pdfIn PDF document text
    • http://risuveliki.rf.gd/puzaje.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/weekly_weight_training_schedule_template.pdfIn PDF document text
    • http://maruduxelukar.rf.gd/fishing_rig_setup_for_bass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c298d5-4706-4519-80a4-cdfa19c00e5d/ncaa_division_2_football_all_american_team.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/wujizarojazelufifuxedix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2597ed8e-b9d8-4ce1-8803-b7289c04d54b/27803534359.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/emmeline_pankhurst_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa9be1b-7242-4440-b9d9-f771f96cf78a/i_was_quiet_but_not_blind_meaning.pdfIn PDF document text
    • http://ziradisam.rf.gd/wumimexosufilivi.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/xafevexozuvugu.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/50060069316.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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5208 bytes
SHA-256: e8d8d8597df4460a2e37e2b44c0688c37dddc882e5bda03ed2595f86241fd08d
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10516 bytes
SHA-256: a40506bcbe70ae8794e7bea1f707a969a7bc88f59c662f9fbc709c514584e6d2