Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad097e7dd1153fa5…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 07:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58126cefb9c510d46da75788aaaba5a2 SHA-1: d3471c29611fbfce0259ccfced92b057e4dc4a7b SHA-256: ad097e7dd1153fa5cb9321439e231c9b0b6cc568d32941f09a79b2a174e8512d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=academy+stars+5+pupil+s+book+pdf PDF link annotation
    • http://wigemefigiw.mygamesonline.org/3331698296.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/56854218033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fe38dac86d26.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/fijewuxetegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_60434570e340a.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/audyt_energetyczny_dom_jednorodzinny.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/2746700204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_604ed00012aec.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/appropriate_outfits_for_first_day_of_school.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/data_science_do_zero._primeiras_regras_com_o_python.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fe1f23a5786f.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/64cd53b8-592c-4f6f-9e08-dc5bb5e14357/kudomino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b626ad2-43e3-44c3-8abc-d9563133ca23/the_alienist_book_order.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/warhammer_40k_codex_8th_edition.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/examen_ceneval_bachillerato_2020.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/ledudesapovidatozemoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9b41ff-d5d5-4825-8412-b1a59f99089c/besukonurevedozulikakojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368e2421-419d-4fb1-be3a-231727b59aba/cuando_termina_cien_aos_de_soledad.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/the_secret_life_of_the_american_teenager_season_6_cast.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 5720 bytes
SHA-256: 796219548ebc327cde839b8f70ad076b833ecdd6c31dc4861bc3dbe160e2e639
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10892 bytes
SHA-256: ccc61c342d7a7a792232eddfbc99d7a8a27514f0a257cbd47188932a7f1d2cda
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 17012 bytes
SHA-256: d66cd1cdb7d8e34e95b090ae1ff8ee9a22f5d5a4a9649f93a2bc44db833a9f28

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