Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93edaca0e35182a…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cbbe6f5d77e67f8b91f0facd28908465 SHA-1: 510dab5c82f6db6dbb9e5a338e60e44d2d0a7b9b SHA-256: f93edaca0e35182ace254cbf77313e5550f92484eee1decdd1d5804b0f850fc6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=conjuntivitis+adenovirus+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477629/normal_60386eb827889.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/how_to_calculate_bank_loan_interest_per_annum.pdfIn PDF document text
    • http://terugate.mypressonline.com/rosemary_baby_review_indonesia.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/nipakimolepozabubige.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/68820321079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fcce375924bd.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/all_derivative_and_integration_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_6052fae93f776.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/christmas_songs_trumpet_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6015f0b9a912e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385853/normal_5fde535ad597e.pdfIn PDF document text
    • http://jixewelo.scienceontheweb.net/61600081076.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/31666865511.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/1068ce91-094d-41bf-8a8c-12a1b5c9dba7/month_end_closing_process_accounts_payable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f17547-6bad-4983-bd5e-ec741f22f9d5/what_is_the_best_keyboard_with_weighted_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7087bc5-de49-4e5d-8915-e2fecb680323/le_petit_nicolas_film_complet_en_francais_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d1b127-ead3-4c76-97e9-8b86e16b3fd5/how_to_make_a_homemade_face_mask_recipe.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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 5044 bytes
SHA-256: ed985c94f62514972a7709e114a631d013ca61ff9450754d21ba2a7b062c0e87
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 11828 bytes
SHA-256: 2089497d04871911eebec7695a1f3779e6f0d4fe5117e0eb833ee48fd2e17663

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