Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd80a695fdab2a3…

MALICIOUS

PDF

396.6 KB Created: 2021-04-01 01:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 121b45eb9f779122c14c3bdefb99eeeb SHA-1: d284a460e25e9e2770fd0cd776b04da1ce3ea211 SHA-256: edd80a695fdab2a37e8f21d6d7a18db8737018c6205122c1c334271126c424dc
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure using an SEO redirector to disguise a malicious download. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs, particularly the primary redirector, are key indicators of the attack's delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/123?utm_term=msh+brain+manual+pdf PDF link annotation
    • http://about-igsupport.com/93831553949q3zru.pdfIn PDF document text
    • http://nogefoxezegu.22web.org/graphing_exponential_functions_worksheet_1_answers.pdfIn PDF document text
    • http://puzigodemabotod.iblogger.org/black_bat_wings_template.pdfIn PDF document text
    • http://masajsalonunuz.com/versatile_sew_in_weaveb1s0f.pdfIn PDF document text
    • http://mamontov-net.cc/sariguxaxelexoduramebavefdspyj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5ff1b6200d4a3.pdfIn PDF document text
    • http://agencymedia-ig.com/citizenship_in_the_nation_merit_badge_worksheet_2019inrj9.pdfIn PDF document text
    • http://pedrons.space/summary_of_the_book_code_talkerj6njp.pdfIn PDF document text
    • http://devlp.design/43396219815ninx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_6062f71235443.pdfIn PDF document text
    • http://copyright-infringement.business/cuanto_gana_un_esmeralda_en_amway_argentina1tjar.pdfIn PDF document text
    • http://daimontimur.org/tyndall_federal_credit_union_mobile_alqp7rk.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/jmj_school_paschim_vihar_admission_form.pdfIn PDF document text
    • http://reestr.site/honors_geometry_triangle_congruence_worksheetaskw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_60550344beefd.pdfIn PDF document text
    • http://bigchance.pw/114507897594hdjn.pdfIn PDF document text
    • http://lnstagrambusiness.com/gipajukudinax4kf6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_6046541bd670c.pdfIn PDF document text
    • http://smeshnoykir.space/new_gems_english_reader_6_workbook_answersf5p95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jirizaxewusi.epizy.com/49169813108.pdfIn PDF document text
    • http://xatenekoroxaju.epizy.com/california_service_fee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44239dfd-2a5d-404d-85fc-a65a1e5f79b7/how_to_determine_bond_angles_in_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a42849-fadb-418a-bcfa-be56e6a1a85f/interpreting_line_graphs_year_7_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b30eda-f626-4fc0-9554-4a1b7c84f08f/28042501631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62af1132-df4c-4244-b47a-389577394dcb/seo_for_dummies_2020.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_off0005e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E226 5428 bytes
SHA-256: 59f489557137824536daf7d021db2b6a1b58c0c645e07f88d12fa91714cd00ba
font_01_sfnt_off0005f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F46E 13964 bytes
SHA-256: ee71dbebcf91e0972227bec4570dec3b36762d64125ea0e90d7584b62f4deca4