Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ea99c18ff4056e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 00:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 48fa908939afb86ed29a68c87ca1995f SHA-1: b2eb2043a4c35668731c034011dedf0d92cefab7 SHA-256: a3ea99c18ff4056e64566b7dd7d7b0ef57e54401f6415d169fd321c429cee715
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including those on disposable hosting and potentially used for link farming, suggests the document's primary purpose is to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall structure points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://nipisod.ru/wix?keyword=excel+cell+function+worksheet+name PDF link annotation
    • https://cdn.sqhk.co/parikozug/gkgeAgh/world_war_2_us_training_aircraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_6042b55fe5836.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/hgCrjje/niduvapuvezejosimu.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/gkggoek/black_girl_skins_namemc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_60306abe0fcd6.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/imam_bukhari_books.pdfIn PDF document text
    • https://cdn.sqhk.co/butixasa/ngc1jiy/pidixopapakepulosebelufab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fff22e243217.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/jVhbGkt/marble_solitaire_board_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/jfTicJc/btc._com_pool_payout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_602fdc5662bcb.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/ioK9KpO/1500033453.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/c2jgCMf/neighborhood_watch_movie_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_6029a6c5a130d.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/qgjLSKn/dark_green_poop_for_days.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/jivubatugiware.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/buxogefowo.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/7514735466.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/asterix_e_cleopatra_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/wetuxibimigadofifak.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/tu_puedes_sanar_tu_vida_resea.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/horizontal_recyclerview_android_source_code.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5300 bytes
SHA-256: a73c81905fac15cbf7f72e314acd76f0890235d3a1e6391b4f89ecf91eefb402
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 11136 bytes
SHA-256: f602b302f70630bc09e8379e642751124d9b88e1ea2df6471ae92e9d5fa4da14

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