Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90889002127af10…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 14:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a7b198c5d23438dcea136b57707325a3 SHA-1: 9b085196c2f588f4b4ec76af376966445e238707 SHA-256: a90889002127af109995ea54c112df67499939566e20ae60b22401fac3d65d44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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, and the presence of numerous external URIs supports this assessment. While no scripts were extracted, the structure and URL distribution suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/award?keyword=basic+management+accounting+concepts+pdf PDF link annotation
    • http://rizaxezo.iblogger.org/a_scanner_darkly_-_un_oscuro_scrutare_trailer_ita.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/icheLic/grammar_worksheets_for_advanced_esl_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/4JigAhf/38937878972.pdfIn PDF document text
    • http://zapizimibit.22web.org/simple_travel_expense_report_template.pdfIn PDF document text
    • https://manomukujoputu.weebly.com/uploads/1/3/4/5/134517900/782042.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/puvurexavujup.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/fXDV7gi/pujuvozidodexo.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/geZgePw/cooking_fever_hack_unlimited_gems_and_coins.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/27f00979-60bb-4cf1-8a95-eaf58ca310eb/mackie_1604-vlz3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/kufuxizepub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9fac93-f7bf-418f-b3b0-75802a31f496/sirulumotugere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df975f5-abf9-4435-94e9-6c7be99738e0/72932439317.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/96250611127.pdfIn PDF document text
    • http://nezebur.epizy.com/impressiveness_of_reported_delay.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/chitralahari_movie_songs_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/imperative_spanish_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/garmin_vivofit_3_gabrielle_review_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac61a00d-a37c-4454-a06e-e71859df1eb7/list_of_differences_between_dogs_and_cats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d340862-1609-426b-94ab-c737fa179c15/best_writing_contests_for_high_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba56194-e077-451a-bc79-d86c50bf7830/regadodaxugofizefu.pdfIn PDF document text
    • http://zarevarepi.epizy.com/rscit_result_2019_september_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c98934e-3b12-42af-9a07-958c5901579e/singer_6212c_bobbin_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599f4dc9-b2cb-4051-9a7a-d1c83d336dbc/18664525689.pdfIn PDF document text
    • http://vopimivukaf.epizy.com/food_brochure_templates_online.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5396 bytes
SHA-256: 0ff1271c455a54944407c80c73d34f91ccc6baae61d91694cbe0365a357d8e5f
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 9628 bytes
SHA-256: 8bed2349fe10a1d04f17bdb866c5089182352d9c315522dd72e69b47755cace3