Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d726291d45fa69…

MALICIOUS

PDF

120.2 KB Created: 2021-05-07 04:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c943fce3f28b1eeee0df4ac8639d826 SHA-1: db9a83252f2e2c3cac96c8566a0645d7e3dd5bba SHA-256: 10d726291d45fa69779dfbb1c27c268862601ea48fa0f784708d68eefc97fbf4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the nature of the URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=altered+carbon+season+1+episode+3+full+episode PDF link annotation
    • http://geosen.net/beriwalufomitefiypw66.pdfIn PDF document text
    • http://moscowflowers.online/how_to_crochet_left_handed_step_by_stepzvu61.pdfIn PDF document text
    • http://zdsshop.top/raymond_chandler_evening_cyberpunk_fight4ufob.pdfIn PDF document text
    • http://rgtuitp.ru/expository_graphic_organizer_5th_gradedrvoz.pdfIn PDF document text
    • http://finansi-7.online/zuretijosu1rhsx.pdfIn PDF document text
    • http://bellissimo.online/zolamadojugegajewosageloj59bwb.pdfIn PDF document text
    • http://lavka-karamel.ru/regonowuxenizeoz4dg.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/hhhbM15/87246610300.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/hiagchb/rocket_sky_hack_apk.pdfIn PDF document text
    • http://jobauthor.online/wedding_alcohol_calculator_spreadsheet7vi4s.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/b7f91d81-cd57-4dfe-9a62-2d146c347288/chicco_nextfit_zip_installation_seat_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2240bc-7355-4466-a42d-d6c32a6a7d9b/republic_plato_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9653f83a-32f5-46ee-889a-28fca6532d8a/how_to_identify_rocks_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8642550-b53a-4cc8-94a7-46fef1037f2d/how_much_money_do_material_science_engineers_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ba6e41-1e88-4154-bb92-fbf1af5b4772/fundamentals_of_english_grammar_with_audio_cds_and_answer_key_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2028ca39-78d3-4968-9cef-b652632c17ac/manual_korg_x50_espaol_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11d9a53-c39c-4734-85db-25139845e1f1/zuzatovikufaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bb7f4b-4674-48ce-9343-fb9ac1e84fc9/heil_hvac_distributors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b222b3fa-6200-4bcb-b333-62d477618fab/34926521929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072f8d86-41b1-4d26-930a-c786d7765840/devezusixavojukipigef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c6ec14-6228-43a9-8a90-87781387946d/petuvoburaluni.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_off00019450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19450 5492 bytes
SHA-256: 310310a637435a7c5a6d80dce7aee6dfc4f442a5756f09dc5af0e6b3e63dbc3b
font_01_sfnt_off0001a70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A70E 12660 bytes
SHA-256: a5c8dc35a287f4fa104f10107fd2b4181db8f75e55c2c9b8557225567f801b74

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