Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2b006ab6badb82…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 02:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7e2f27719030548ce520422f8ba1bfff SHA-1: 155d53c406d0c39022807d5c58af4fed1a85df19 SHA-256: 8f2b006ab6badb82d7f72ed5b643445274a2713ed86c4b094c68cb1a19f55d79
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://xajibur.ru/award?keyword=precalculus+textbook+pdf+download PDF link annotation
    • http://vigastlens.xyz/8562447637000lpm.pdfIn PDF document text
    • http://pipvip.ru/nylon_6_12_safety_data_sheetw3ti0.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/80554766026.pdfIn PDF document text
    • http://miiliioner.xyz/kitchenaid_refrigerator_repair_san_diegoqyi2q.pdfIn PDF document text
    • http://fitit.space/bingo_game_template_printablesbwkd.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/94422728610.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/articles_grammar.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/ace_english_book_adda247_download.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/bundesliga_2020_18_spielplan.pdfIn PDF document text
    • http://dom-bita.org/2004_chrysler_pacifica_battery_drainyw0hz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikomum.epizy.com/appsc_group_2_syllabus_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da1765e-1512-488d-88f8-556ac38d8fd4/varuvagesidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf6ab4e-d32b-45b8-961a-648b21f10cd1/bagazobopepirizig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55352fdc-0a3c-48d5-b37a-f9b3000df83f/96151956070.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_0c7fd1ce06d54c828b33ab9d36fcf5ed.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_78fdbe16a2e245c2ad552fd776de6cb3.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/autodwg_to_dwg_converter_registration_code_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eaec78c-0854-48e7-84de-2839210d12cd/what_is_the_best_light_therapy_mask_on_the_market.pdfIn PDF document text
    • http://dekifovep.epizy.com/60988526839.pdfIn PDF document text
    • http://viromumixemet.rf.gd/xewedanilitasamududebagof.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/punjab_national_bank_education_loan_application_form.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/architecture_building_design_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff88be9d-4923-40fa-b932-a99e67c4a631/romeo_juliet_quotes_baz_luhrmann.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_e189aff0d1c840d1a3b4b7c5e707b82e.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_120b18f4604049d1b1a0dcac9e587be5.pdf?index=trueIn PDF document text
    • http://duziroro.myartsonline.com/celestine_prophecy_book.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_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 5516 bytes
SHA-256: 87769093cfc7f2b1efd89900e233cec64e2e826771f3511ed1d85fd8d96fda08
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10532 bytes
SHA-256: 3e5832d67ad809241b5ffe8f6c3ac54f7bcfaa992d8c70113d67d49640fea167