Malicious PDF — malware analysis report

Static analysis result for SHA-256 921a1a8c81a5a371…

MALICIOUS

PDF

84.1 KB Created: 2021-04-22 18:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 58eb087a625fcab4d33a2ed65dfc2277 SHA-1: 25e493d2459029bd95b37202a954f19e1f11cc2e SHA-256: 921a1a8c81a5a37192bdda0d95c4464757af9d78fe457d259725a7497c8afcaa
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=what+words+should+not+be+capitalized+in+a+title+mla PDF link annotation
    • http://wasatosu.sportsontheweb.net/remstar_pro_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/Ajj0Ujf/97361116962.pdfIn PDF document text
    • http://ximasoj.22web.org/75334651223.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/Dji9rnR/60641219638.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/gfbercu/lightroom_download_for_pc_windows_7_32_bit.pdfIn PDF document text
    • http://ionatr.space/small_incision_cataract_surgery_videohbl2d.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/comment_assembler_deux_en_un_seul.pdfIn PDF document text
    • http://samettemiz.xyz/new_worship_songs_2018yqypk.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/jfieih1/fps_zombie_survival_games_for_android.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/data_structures_and_algorithms_books_in_javas6lu0.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/trastornos_alimenticios_bulimia_y_anorexia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/avital_ronell_books.pdfIn PDF document text
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_347d660cefcb4d3a81b0e8b1a0d7cb7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47982abf-4694-4032-9090-85ad5c8ace5b/88889903643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babf87ba-f0ea-40e8-99a9-5967532bc009/why_is_my_grill_not_heating_up.pdfIn PDF document text
    • http://wojotefeva.rf.gd/56440553029.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_b468509678124f57bde45a8967010b8d.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_5638333b414f4d9f83a8a2f2888d0b21.pdf?index=trueIn 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_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 5608 bytes
SHA-256: fb2375b8db37b9ce1ae39806cb7b8328b9486c5db503eec26852ee2b9a305703
font_01_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 11036 bytes
SHA-256: b1b1cc45a79d0c826417b635000a0bf1af47158d0da7ea4d60d61c27da9f44c2

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