Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12580275430e7fd…

MALICIOUS

PDF

69.3 KB Created: 2021-03-21 08:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 803897d66768548ea58b7ab8132f2f41 SHA-1: 5aa657f037efdceeeab0d82c521d756e7fe86c01 SHA-256: b12580275430e7fdb2ae19329865b0d54954e4b8a3936a00511bad553c8a1a58
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/award?keyword=barron+s+sat+physics+pdf PDF link annotation
    • http://cookwellbakewell.com/6456982397bxme3.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/burt_bacharach_alfie.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/fYIUxXL/what_movie_premieres_today_on_hbo.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/effective_communication_theory.pdfIn PDF document text
    • http://myirn.icu/fender_twin_reverb_circuitavbk6.pdfIn PDF document text
    • http://nosinoski.shop/goviturakah2hej.pdfIn PDF document text
    • http://www19216801.site/new_mini_mastercraft_2020_onlinesvvdy.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/ntn_bearing_catalogue_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/eYbuW7G/punamobiguwifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_602a82c38264e.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/QhceYrS/86175098101.pdfIn PDF document text
    • http://manovina.mypressonline.com/mipuvarusixibikawik.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/sat_test_dates_2020_south_carolina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_5ff03da062efc.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/what_does_terminate_mean_in_mathvfyhe.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/life_fitness_elliptical_battery_replacement.pdfIn PDF document text
    • http://werojati.getenjoyment.net/informatica_command_line_reference.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/c15d3c3e-4f7c-478b-acc8-b2e25d553cd5/46812604714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cde123-4421-4ed3-9cef-7781bd06e997/did_the_mayans_invent_soccer.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/47956060342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0049ba-20fd-4b3c-a42e-8f5f19290777/how_to_find_initial_velocity_without_time_and_final_velocity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e138a5e6-436b-4e6e-a31e-7f2efa5e1dd3/91310993705.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/free_printable_abc_flashcards_for_preschoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aebe975-e109-4dfb-8926-c3f254f76b5f/speed_queen_washing_machine_error_66.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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 5360 bytes
SHA-256: 6327f7028aaf49a36b0c07b096e7a6d5d67d6d6bc8cb342cc3e32fce506d7312
font_01_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 12832 bytes
SHA-256: e53093e62c31775490290976da0aad2dec013ba1b8c57d030a70d688cc293741