Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c80e45f5bc919a…

MALICIOUS

PDF

73.3 KB Created: 2021-01-10 17:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8c065a4b44b429fa735534161f6c2a09 SHA-1: ce0bc6110c9c4abe0f797408a4fd220c49e6e71a SHA-256: 87c80e45f5bc919ae66459ec46033b73562e8ded3a8e2b510b6bb4635eef39c9
126 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'autocad 2020 crack product key' in the document body and a URL indicates a lure for pirated software, a common tactic for distributing malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=autocad+2020+crack+product+key PDF link annotation
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/roguxujukizoza_wetimem_zifizozuwof_tirerusomup.pdfIn PDF document text
    • https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/fb9ef9.pdfIn PDF document text
    • https://site-1181076.mozfiles.com/files/1181076/woodworking_plans_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/ifCjeih/28735455221.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/bally_s_executive_king_suite.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/haEsoge/dhoom_4_release_date_2020_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fdb91004c4eb.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/Wib5QGc/best_race_tune_for_6._0_powerstroke.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/business_management_degree_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/0ihMjgc/women_s_second_hand_clothing_stores_calgary.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/ujaifhh/73388598045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409257/normal_5fe0dfb759078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5284 bytes
SHA-256: a7a1f09178e0edb280277b61b85a68c74edacc34e1090f2fe6cc5d2056eb1e38
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 10688 bytes
SHA-256: 7df1a1e84f4e2021a098e3b2212f6977304bcc2e71330bbf6da91fb869949700

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