Malicious PDF — malware analysis report

Static analysis result for SHA-256 4260595842288726…

MALICIOUS

PDF

75.8 KB Created: 2021-06-10 19:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 711149ed50bd5b5e4404485277a00a23 SHA-1: 340714190e983c8d32cc68a1fd9547f0362a4239 SHA-256: 426059584228872656c92ed7183a1c0216ad6765015aafc23661089f3706d49e
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://jacksth.ru/123?utm_term=calibrate+gps+android+6'. The PDF's structure and the presence of many links suggest it functions as a link farm, designed to direct users to potentially malicious content. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/123?utm_term=calibrate+gps+android+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60199f575a3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_603050aa04eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6061a0e388b90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_600711842ad35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_606a8f0436c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_603f6b0c9861d.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/f7d2d5e7-9cea-4b1e-8d13-96dcb99d6ba3/what_is_mass_communication_in_simple_words.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/f/codigo_de_etica_profesional_del_criminologo.pdfIn PDF document text
    • http://pozapagula.pbworks.com/f/final_destination_3_tamil_dubbed_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117614f2-0d2e-41a1-a736-8abdd1d32cd6/what_is_the_average_mileage_of_royal_enfield_classic_350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2f5fca-5588-4fa9-8150-8c338e7b27d7/mulelegawagaxewabatas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a9575a-96fe-4ab2-abc9-29dc570c2c1f/38338988038.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144590370/what_is_holy_anointing_oil_used_for.pdfIn PDF document text
    • http://fekofowipuze.pbworks.com/f/sundari_kannal_oru_sethi_song_bgm_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fd2d93-8331-4d8a-828c-4584c5f0a002/apes_math_review_answers.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144445857/how_to_make_a_motor_coil_winding_machine.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/w/file/fetch/145032627/gegogamaf.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/61441160141.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5328 bytes
SHA-256: 331ef490e0f05597a524aa5a053fb255ad32cd44edc226b56087858711ce5b02
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 10844 bytes
SHA-256: 2363027812c1b2947b05cd670f0ccb98d75f7ccea75203522befea712689ff0e

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