Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c05eb5a1c2d057…

MALICIOUS

PDF

72.3 KB Created: 2021-03-24 19:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5102789b54d86b2c958f39a460aa3857 SHA-1: 551800365809fbb4d22f3c91f501c991cdd1dfbb SHA-256: e8c05eb5a1c2d057e485dc75de29db99c55238bc0aedf7bfd51bb9491f0549e4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=wheel+of+time+book+11+pdf+download PDF link annotation
    • http://igonlinesupport.com/dogilogepuwabomilojasuja8hf9h.pdfIn PDF document text
    • http://mamajan.space/candid_camera_appjlrmo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_60243c7d4b871.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/nixanumepuberewafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601cb182315bb.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/67414802491.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/kathryn_kuhlman_books_amazon.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/54393428624.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/20724222177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5fe80c5c7fc2f.pdfIn PDF document text
    • http://betixisu.22web.org/physics_answers_chapter_3.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/14910617375.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/ford_1715_tractor_ignition_switch.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://s3.amazonaws.com/guvovigo/5037397040.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/mizetat.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/vunakotokamepatagib.pdfIn PDF document text
    • http://nadiripu.epizy.com/tipekalevesokofigumovaz.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/how_to_reset_my_american_standard_thermostat.pdfIn PDF document text
    • http://xewenofos.epizy.com/incomplete_dominance_practice_problems_answer_key.pdfIn PDF document text
    • http://bulegenarofil.epizy.com/on_the_app_store_badge_png.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/how_to_set_up_a_pole_to_catch_catfish.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_off0000d0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F2 5156 bytes
SHA-256: 578ae470292730c4eec0c3df0d7cd5e6fc42101787af0fdf90785703e03a1466
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10348 bytes
SHA-256: a2025f464f2b5564869d83916a037688146e7d252a4c63d2381f93a641734f23
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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