Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d09c37f77a2227…

MALICIOUS

PDF

100.9 KB Created: 2021-04-10 19:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e9420006d7034fc9bb1ba3c0f8bfb4b SHA-1: 20832c3e711cd5cd356e1bfca70ffe57ef2221c4 SHA-256: 21d09c37f77a222776dea3b61d06966285f06b403b43c4c2a274d0106504c554
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a free download. The ML classifier and ClamAV detection strongly support its malicious nature. The primary IOC is the redirector URL, which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://midufefew.ru/strik?utm_term=great+love+story+book+series PDF link annotation
    • http://metazoaapc.fun/jenn_air_refrigerator_repair_serviceuwj5i.pdfIn PDF document text
    • http://erse.xyz/ielts_reading_strategies_rachel_mitchell41oni.pdfIn PDF document text
    • http://vashastrahovka24.ru/mirro_pressure_cooker_22_qt_partsgo948.pdfIn PDF document text
    • http://prognoz-football.club/chronicle_herald_crossword_puzzle_answers53jmk.pdfIn PDF document text
    • http://appletopshop.ru/mewaruxagogiwexezan8sbwx.pdfIn PDF document text
    • http://fito4ka.xyz/contingent_asset_off_balance_sheettvalh.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/deism_vs_theism.pdfIn PDF document text
    • http://italdom.fun/the_magic_of_changing_your_thinking_full_book_law_of_attractionu8kls.pdfIn PDF document text
    • http://iclod.tech/chandramukhi_tamil_movie_single_partldo49.pdfIn PDF document text
    • http://20970907.net/map_of_ukraine_with_citieswl5zf.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/25437730281.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/volume_of_cone_worksheet_grade_6.pdfIn PDF document text
    • http://com-connexion.xyz/612014924641hjjg.pdfIn PDF document text
    • http://workbykoder.xyz/aparato_locomotor_para_niosjqm53.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/96732016028.pdfIn PDF document text
    • http://leafester.online/759106345291dpzr.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/pazovugal/wing_chun.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/free_check_register_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/jamaica_farewell_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/kubla_khan_line_by_line_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/school_id_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/risk_assessment_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/47796452428.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/eating_guidelines_for_type_2_diabetes.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE7 5076 bytes
SHA-256: a6771a2abbd1d80ffcad16c348dd2ed76f5a6c49996560dbf11421be85186725
font_01_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 12796 bytes
SHA-256: 0e822b54d63f4b364e3c9459245251c441d205e69e27793a49cf2b0a2e8f48b2

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