Malicious PDF — malware analysis report

Static analysis result for SHA-256 845ba5f8ed54d0b0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 13:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a1589b12e50717a01ab6bfc23b9db1bf SHA-1: 9309fd91d10636f292424825392d115ec0d42548 SHA-256: 845ba5f8ed54d0b00bb5f5d85fb98474afa232bc7cdc2aff882aecd4a66ef4e1
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('druttle.ru' and 'gelupulofevabek.medianewsonline.com'). The PDF's structure and the presence of many links suggest it functions as a link farm or a lure to external content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/award?keyword=cognos+analytics+architecture+pdf PDF link annotation
    • http://gelupulofevabek.medianewsonline.com/69665489448.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/english_speaking_course_for_adults_online.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/what_is_license_document_number.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/what_is_the_short_story_charles_about.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/81073560651.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/3d9a896a-55f1-4608-83ad-12e473ac7a56/sewukebokizegesidufu.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_fd463387ba354a139ff2ea2b067777fb.pdf?index=trueIn PDF document text
    • http://jokosen.atwebpages.com/libro_los_seores_del_narco_anabel_hernandez.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/pulusaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b5991d-30f1-4173-b7a3-ee91246ad0c1/zasimeroxajax.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_86e6f7e301d1424387e8161dba0a52bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozetej/gubidajarewobitim.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/14476581905.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_02fdc441bf3d4b00b5366ad7e2e6158d.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_b877260ade5d49b1b87ba82ad6cb0193.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e0a3fb-6474-4c1d-b341-58aa62562fad/how_do_i_reset_my_kenmore_freezer.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/report_card_comments_for_high_school_art.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/life_under_stalin_video_questions.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5424 bytes
SHA-256: 62ce38bed14726e818851400ad0ea053e563aa377b0f5cd795f3de6806abfd6e
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 11056 bytes
SHA-256: b1a865333d89ea2b942a5e4719b34366aab3aafa33358843d8909ef3372dfc90

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