Malicious PDF — malware analysis report

Static analysis result for SHA-256 9416979fb96384c2…

MALICIOUS

PDF

81.9 KB Created: 2021-04-08 04:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6ef0b995f352db27570617a4428e722 SHA-1: da4ecea59c567d0bd6972ad3b81a553beffde041 SHA-256: 9416979fb96384c2a121f1743726a0510e75d5d41af1b13b5765ec1d6bfd3393
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://baarspo.ru/123?utm_term=blackstar+ht5+mkii+manual PDF link annotation
    • http://naykaryadom.fun/how_to_add_and_subtract_polynomials_with_different_exponents4lbrd.pdfIn PDF document text
    • http://sk-anker.ru/best_free_tool_to_create_architecture_diagrameypm2.pdfIn PDF document text
    • http://kprovk.xyz/87011994055n8aie.pdfIn PDF document text
    • http://zoomita.space/two_way_radio_headsets_for_saleyn02i.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/ruxezu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/gehhEjd/8154935834.pdfIn PDF document text
    • http://vostokzapad.su/lewekituzaguwelifilulommmw61.pdfIn PDF document text
    • http://teren.fun/el_cantar_del_mio_cid_._autor_annimocpv8g.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/m57ijoZ/pobrecito_spanish_slang.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/mixed_use_building_design_concept.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/watezobebewarutok.pdfIn PDF document text
    • http://teksalle.xyz/rosiflex_trio_tablet_compositioni3o1m.pdfIn PDF document text
    • http://nicepics.xyz/roziref5yfr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_3c4128d6719941c2b0919b004c0f38e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e00492-b9e5-493f-86fb-7a95e3104893/does_tai_chi_help_lower_back_pain.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_1d8786473230434091d9b7e4da56282c.pdf?index=trueIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/rufugixafakikiwas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0a516e-7ac3-4c0b-94ec-5a6309d5e9f0/2019_lexus_es_300h_fuel_economy.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_0da39725f77347afb1a7f6d40df2e732.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6184011-711f-4ff2-9ef7-c1b597cd6f02/41253868020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca2bc29-5706-4ea6-b793-964ae2ffc765/harry_potter_game_2021_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9886ec09-b3cc-4d31-9605-56029addc86b/which_gre_prep_course_is_best.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_b2d2009000484768bb4d46f439023220.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_db631ba80dc3457fa454b5e156bc4039.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/los_juegos_del_hambre_3_online_gratis.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_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 5276 bytes
SHA-256: b8a85b3cb3a30e6322baa05eb2876acae3f962719bd85b98048c21234deccd13
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 11432 bytes
SHA-256: b7af36ea0f1e89aad7390cf26ade289a79adea539a0d699a3f2c6a210e6dacc2

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