Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb65fc021da1b57…

MALICIOUS

PDF

79.5 KB Created: 2021-03-12 02:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6b84104d3d355951fda84e8c10704119 SHA-1: 6fdcb2b8f14813314f8634262c5c007dee4ed079 SHA-256: ccb65fc021da1b5759f1c94f0ed7c74a9e1ead05ccee1b50c316268b48353203
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and another to a domain designed to mimic legitimate services, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=grade+5+social+studies+textbook+online PDF link annotation
    • http://lonotel.mygamesonline.org/vuvabeb.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/77681225221wgsm4.pdfIn PDF document text
    • http://workbykoder.xyz/how_to_update_amazon_kindle_3rd_generation0wook.pdfIn PDF document text
    • http://reweder.site/honda_odyssey_2008_manual_en_espaolc663i.pdfIn PDF document text
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/6376358.pdfIn PDF document text
    • https://cdn.sqhk.co/kopupelek/EJgfXgh/76512750287.pdfIn PDF document text
    • https://dinofewujib.weebly.com/uploads/1/3/1/3/131379591/580518.pdfIn PDF document text
    • http://meblik.su/julian_date_calendar_non_leap_yearblhx2.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/MiEPIih/homeschool_schedule_template_5th_grade.pdfIn PDF document text
    • http://perevozka.ru/65758856965h13ub.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/gghrjeC/rope_swing_fails_2016.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/what_are_some_examples_of_codes_that_can_be_sent.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jovekus/rhino_warframe_guide.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/mechanics_of_materials_7th_edition_solutions_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12c2dcd-fad6-40a0-b515-2ecb23dd0392/yamaha_40_hp_outboard_workshop_manual.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/writing_english_language_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da679511-40e2-41d3-9671-ec67c2df3eec/magic_tree_house_book_14.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/premier_credit_report_dispute_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d03ca40-512c-4c4f-b9b0-79a5c602eade/instrument_used_for_checking_bp.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_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 5360 bytes
SHA-256: 50f818d89c34a6c92cc32de0ed583634db35d12972c1954b617ee2e2b7265aee
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 10600 bytes
SHA-256: d68339f94a7381f8342f36d7068bc9c039bc3c0c2825ed511c82b9702544005c

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