Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea038c84ae8a82c…

MALICIOUS

PDF

78.2 KB Created: 2021-05-16 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4df1d0503a2d71bfb91c284ebb9a5436 SHA-1: d85d719bf9ddd7c9fe80bb6890656a4a9e28fe58 SHA-256: 4ea038c84ae8a82cba0f770d9fb213bc8eabc341a43b2a27288595116dfa20c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=nixon+the+player+gold PDF link annotation
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/7175438.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/rapidex_english_speaking_course_gujarati_book_free_download.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/tibafupaxifu.pdfIn PDF document text
    • https://tubadelemifevit.weebly.com/uploads/1/3/4/5/134509228/a64f35d75ca36.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/9349321.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/gd9jfhf/subway_princess_runner_game_install.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/thyroid_cancer_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/RyMjajd/kepedegosajas.pdfIn PDF document text
    • https://xiwirananuwiro.weebly.com/uploads/1/3/1/0/131070481/7644655.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/muwefosot.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/gj3jcib/dragon_city_mod_apk_download_unlimited_everything.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/pabevixabudokukigolemeg.pdfIn PDF document text
    • http://profoto22.ru/9729109692229ao4.pdfIn PDF document text
    • http://zedateve.mypressonline.com/phonics_reader_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/4gcfsif/run_and_shoot_offense_college_football.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/icje9Ki/chaff_organizer_day_by_day_a5.pdfIn PDF document text
    • http://sk-anker.ru/brother_hl-2240d_series_printer_driverxz2c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikalasur.epizy.com/zagazitigezunawemabusoj.pdfIn PDF document text
    • http://xisuwujilaxemer.myartsonline.com/2020_nissan_armada_owner_s_manual.pdfIn PDF document text
    • http://fuzemonuxeli.rf.gd/original_greek_bible_translation_to_english.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/english_vocabulary_book.pdfIn PDF document text
    • http://kebawobokatole.rf.gd/96636705202.pdfIn PDF document text
    • http://vuwonipaw.rf.gd/diranezevijekimiwogilox.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_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 5180 bytes
SHA-256: beb994cef233248ab252b7ed41ff101ea2b4c9c4f8ee0757e66672a61669a371
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10808 bytes
SHA-256: ea8f8e50502805ee5006d1dd568d3ba6109baa19f31c5cba60e5fb579191f2e7

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