Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ea5b5dd594456a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 09:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 19506cb3ae9d86817e4aa75ec08eaa1f SHA-1: d439667dcfebdebc5d015f7887ced4b2bbd0cd26 SHA-256: 39ea5b5dd594456a841fbcac1c429b25a5dcf18ab8688fd5a2d7c95da2597cc0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a site related to 'the tragedy of macbeth act 3 study guide answers', suggesting a lure for educational content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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://botokaw.ru/wix?keyword=the+tragedy+of+macbeth+act+3+study+guide+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390663/normal_5fceae8194830.pdfIn PDF document text
    • https://cdn.sqhk.co/valumikeg/jaqoiic/novedades_android_pie_note_9.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/V0vIND3/12571138105.pdfIn PDF document text
    • http://xudefoxalobabif.iblogger.org/reluxunufowabosewujato.pdfIn PDF document text
    • http://momexatajuma.22web.org/lajimonusagetanu.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/great_are_you_lord_all_sons_and_daughters_chords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_60321990ae252.pdfIn PDF document text
    • http://zexorusawuwurew.sportsontheweb.net/18377870854.pdfIn PDF document text
    • https://cdn.sqhk.co/fezuvepere/Fhhce24/83874450032.pdfIn PDF document text
    • https://cdn.sqhk.co/peposusuwi/iu27heG/70349953677.pdfIn PDF document text
    • http://manekobe.22web.org/c_print_boolean_format.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/8595547b-70a8-41ab-b00c-ad9b672d96f8/lg_inverter_direct_drive_washing_machine_error_code_oe.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/24073122774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c731ed2c-4503-4330-a51c-3a3f1636e8c2/oxford_senior_english_grammar_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527f225d-4d5d-475f-bf95-297363770a48/list_the_four_characteristics_of_all_living_things.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/what_is_the_best_ccrn_review_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/what_does_the_chinese_symbols_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc23680-a6b5-406f-9908-2af9fde2e800/how_do_you_fix_a_dryer_drum_that_wont_turn.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/how_to_unlock_motorola_apx_6000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb41d897-0a7b-4dea-92e1-55f901770767/what_is_the_code_for_my_panasonic_tv.pdfIn PDF document text
    • http://melibeduzos.rf.gd/zugamevunimojomevaxe.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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5848 bytes
SHA-256: e4bb20cc006d9e3d012f78e38833a93cb68f4e19e9254830d1ae1ee3a10caffb
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10288 bytes
SHA-256: cc7b981acdfa0614b2480adca6cc87dc94ab8a134f6467789f1e9084bd241862

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