Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c4b0f732de2243…

MALICIOUS

PDF

80.6 KB Created: 2021-06-01 17:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: aaac18f2f05f4ab878c356ae7b8a6e9e SHA-1: 95982da75b582add02ec882ffb7b84e93d5b88cb SHA-256: 10c4b0f732de2243960d99d36aab2653eb8eaa443e0b56282557df147c0440e5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The document contains an embedded URI pointing to a suspicious domain, which is likely used to host malicious content or redirect users to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=statistics+and+probability+teaching+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416150/normal_60579a9cbc9c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_601219c7893e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5ea7f8e4-1c60-4ab4-8d9a-434a79d41fb0/duxovezifapovezagija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecec6bda-b3e3-416e-afee-ad1fa62ccdaa/xolekoweradedisaweliruze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726d238a-353b-4ecf-9a51-23ef984a3594/td_bank_wire_transfer_limit.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144445617/christmas_medley_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3e2035-fdac-4150-a447-f7d06d119b3e/90629330557.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144444153/sri_chaupai_sahib_english_translation.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/xupegufuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382e94e1-f267-4c5d-a1e7-f26917f85f1b/72396124562.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144428820/vocab_prodigy_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88af3178-777b-476d-ba6e-327fb0935816/alpine_ktp-445u_not_working.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/wezademelogotarikavule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b06704d-184e-4b0c-ac4c-3a82f4722539/fatigue_icd_9_cm_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733d87a6-ed4e-4221-a32c-8725cbd0776e/pebedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c6346d-19e3-47fa-ad2d-5938388bad5b/skyrim_tips_and_hints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af29cd9-b01c-4b25-902f-6dd6320049d6/what_is_the_theme_of_the_poem_kubla_khan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f2bb7d-0c00-4f86-97e3-52ef8fd3c548/20355553338.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423780/xerevesigudazegaw.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425163/backup_whatsapp_da_android_a_iphone_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d85e3ff-dbc0-4ada-bf31-02e0c22a2c83/55658226650.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438000/word_password_remover_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de0076a-49e1-484a-b277-ba8c381ad432/what_is_considered_the_crown_of_the_head.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 5644 bytes
SHA-256: 39542d81ce73c30422f1d0001c9faf879c8441da0bd0770e17e8cb49475ddb11
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 11576 bytes
SHA-256: 1c00057dd2804a630e38cf6e851b297cd1ad7242aa6eae1ed2757b095b880b1f
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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