Malicious PDF — malware analysis report

Static analysis result for SHA-256 77707c3eed5b8a93…

MALICIOUS

PDF

68.0 KB Created: 2021-03-10 19:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e25ac53859daf815cb29987336e1cb92 SHA-1: 43dbd2fe0ba57fd6e0d38832f13cd7122ac557de SHA-256: 77707c3eed5b8a93590172d325805e07a95121f92e7004c2abfc930a2cb96c32
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though truncated and obfuscated, suggests a lure related to 'sensory details worksheet answer key pdf', aiming to trick users into visiting these suspicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=sensory+details+worksheet+answer+key+pdf PDF link annotation
    • http://tufofol.medianewsonline.com/gudomekubibirakizu.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/ed_sheeran_castle_on_the_hill_acoustic_chords.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/who_are_the_main_characters_in_the_selection_jiskha.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/rubafosadovatebagixi.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/how_heat_mode_works_in_samsung_ac.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/48246866728.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/carrie_fisher_wishful_drinking_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/ntgh908/real_car_driving_school_games.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/410786759.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/ieQieSX/28580800685.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/how_to_reset_a_gate_remote.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/pdf_reader_kindle_alternative.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4879764-aa27-4a68-ab26-086e5c60ea7a/chicco_lullaby_pack_and_play_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d86f94d-7e4d-4b61-8bf3-4b639fb5183d/41492303550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f600a3-354e-4df0-a625-5971660249ba/how_do_you_use_a_ronco_showtime_rotisserie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df6a2e1-5453-4cad-a312-843be3ece2a0/a_cuanto_equivale_150_gr_de_azucar_en_tazas.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/can_you_override_nest_thermostat.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/jisux.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/1852360697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11021f06-fbe7-4816-99cd-2ce4019154dc/6463093848.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/lekifo.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_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 5488 bytes
SHA-256: 8f80a56d42e09d6f83bcc3e9c130333b85fd24f6258e6160d59fbc9174ea7f4d
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 9904 bytes
SHA-256: 70f550ddacbd7be06a3cb79b7ed25b7733fecffee8e175442984825ce22c3db8

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