Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecacbfa4d77bed6…

MALICIOUS

PDF

100.8 KB Created: 2021-03-09 11:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e8feabb933a4082a77e0bbb559be555b SHA-1: c3866f10e482a48e468b5e78207acf343637f306 SHA-256: 1ecacbfa4d77bed69983f208facfcaa930ce73af6d9cfec3fb6fff681a819cd9
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially garbled, contains text related to the external URI, suggesting it's part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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/strik?utm_term=does+the+force+of+gravity+increase+with+height PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500453/normal_6020d16feaa22.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/gchcjb6/days_cash_on_hand_example.pdfIn PDF document text
    • http://podeves.xyz/46525750793n0lx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fd1c8a800d0d.pdfIn PDF document text
    • http://contentmedialiteracy.com/zegutubunurijambg7ma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_6000579514b81.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/eFjbggN/tmnt_rooftop_run.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471114/normal_5ff43f7bd6e69.pdfIn PDF document text
    • http://maxist.ru/420463914312abwj.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/idGriiy/40705752960.pdfIn PDF document text
    • http://freshmind.net/204491956982on4c.pdfIn PDF document text
    • http://raisinshq.pro/nupisetoganibiiehev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/33710739969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a960e01-f108-4aaa-9ca2-8adb6b554377/67919139312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f416e18b-f362-4002-b5e3-9a6bf9981bd6/mivalazifepefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/emulator_gba_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e0d691-efd1-4a9c-8974-59a9d8c584df/new_beauty_launches_may_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/wadir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a92f83c-dd36-4725-b8f1-189c8cd730d0/92328016286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58daa791-3b64-4a75-b439-20629cd273ea/venugabotodur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1746161c-729f-4c57-a9dc-bef92bcda7f7/dukake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138b8741-7c00-4469-80f5-1b1b4c120e97/polder_kitchen_scale_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7960ba0c-9762-47ab-8454-a0df32537bf0/terimisurutemixodoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0358d6af-ed43-4210-a96f-e24f06ff4786/rangers_apprentice_the_royal_ranger_4_the_missing_prince_read_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/abs_plastic_sheet_suppliers_in_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/vampire_diaries_book_13.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 5364 bytes
SHA-256: aedf97428ad18d425dc75958117ae78d13af271a0a5d1681502aad630fec03a6
font_02_sfnt_off00014688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14688 11872 bytes
SHA-256: 9348ef6c64257db5dd824fc833029fec28ab5e791565c0b464212a854c7bd49e
font_03_sfnt_off00016f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F21 16060 bytes
SHA-256: 1c92c2677a7211bdb9cbf3aa97d18a342ff658e3f18f612691e6cda1cc848129

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