Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d2f1747db00b3b…

MALICIOUS

PDF

87.7 KB Created: 2021-03-24 12:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eec77ebfab8366d507dd46b67b91f431 SHA-1: dfc0811c409700972a58822f23817e1386b5660d SHA-256: b1d2f1747db00b3b22f00bd626b9b2710db0133c56ded12b53b166d5b16e1c61
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=after+school+programs+fall+2020 PDF link annotation
    • http://medicinfo.online/procol_harum_homburg_piano_sheet_musicjk6rh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6055a9944f632.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/geneDig/snowball_fight_game_math.pdfIn PDF document text
    • http://slimitalia.space/sijafazanavakawededekasol2c4f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_60552bc82e632.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/what_does_the_bible_say_about_the_potter_house.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/igYT4HN/school_days_full_gameplay.pdfIn PDF document text
    • http://shop-profildoors.ru/what_is_general_anesthesia_for_surgerylf677.pdfIn PDF document text
    • http://helpverifybadges.com/weber_spirit_e_210_partskr9gd.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/vatomegumanenokakupir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_aaf6272e07b247daab164e8d361ef34e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41bed2c-2190-444a-8d42-a6091508c99e/ap_chemistry_balancing_equations_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ebdf19-1ae8-4c9d-a980-3ed6abdf9811/kanso_sound_processor_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a9252f-c4d4-4105-b38f-ee05bc306e17/jewilas.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_0b61b72b5c6b455f901d87b7031dceae.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_cadf79fb89224d3d8a938fa86e25ffef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86caa1b3-67c3-4ed1-971e-447db04b8db5/the_secret_check_filled_out.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/numerical_aptitude_test_questions_and_answers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c19f1b9-b385-474d-8f75-7d29d2b06a6c/python_write_string_variable_to_text_file.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 5328 bytes
SHA-256: c8b7ba42ca1a429efc2fa024036b0fa650f51e9d276c5ce178c42867ad8215fc
font_01_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 10996 bytes
SHA-256: 205507f7b7572174a527304f429b54b608e5c193f287809b145d46c1e0d44631
font_02_sfnt_off0001439e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378