Malicious PDF — malware analysis report

Static analysis result for SHA-256 28246f26d2177fa9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-11 11:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b243b302c34ff82804333ac794a4e26 SHA-1: 52cbf3006ece13c8e322d7245d0a37d96cb84bf9 SHA-256: 28246f26d2177fa9fec5c3f5e29a1a34db9f789445e5b26dac42437157271ff9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, references Spanish grammar rules, likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wb?keyword=reglas%20para%20acentuar%20las%20palabras%20agudas%20graves%20y%20esdrujulas PDF link annotation
    • http://aycotoro5.xyz/psychology_in_your_life_grison_downliylpq.pdfIn PDF document text
    • http://teachersaid.fun/social_studies_textbook_for_jhs_downloadwvn4g.pdfIn PDF document text
    • http://legendnat.space/gowinevesovovolorupljv3i.pdfIn PDF document text
    • http://hydra.moscow/53171589116qaa6m.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/geijfji/92789374331.pdfIn PDF document text
    • http://piriketag.22web.org/57436231666.pdfIn PDF document text
    • http://prizinsta365.online/reading_comprehension_exercises_with_answers_a2z2e5w.pdfIn PDF document text
    • http://ttttrrrr.space/candy_run_5k_20200angg.pdfIn PDF document text
    • http://dupezivekiguje.22web.org/merit_badge_pamphlets_kansas.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/gcbPt6A/mountain_bike_tires_26_x_2._35.pdfIn PDF document text
    • http://lamovingcompany.com/9910559125xve90.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/jahiqjf/45281417748.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/lKZvheh/logo_quiz_game_free_download.pdfIn PDF document text
    • http://dressnbuy.com/rehras_sahib_path_written_in_englishe0evh.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/RjbieRz/98454495259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_dc67bb3bb25e449e9ecf2929f4a0f5f4.pdf?index=trueIn PDF document text
    • http://baponexar.epizy.com/zowipowigepovinej.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_6ec5beebf86c435a83616e9298038d20.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_a23bc7a39e5c4cff87aea4f67af50894.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_939e62f65fdf422cb6321078e4f86754.pdf?index=trueIn PDF document text
    • http://jizonizop.rf.gd/shall_i_compare_thee_to_a_summers_day_meaning_line_by_line.pdfIn PDF document text
    • http://bilunijo.epizy.com/list_of_computer_applications.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_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5628 bytes
SHA-256: 1f3ad6fb90b7d536928530d8666379a797daac1466221ced85a9c8531a9c0dc8
font_01_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 11632 bytes
SHA-256: 86ebbbedc8486e2bbb021d6a96861f8986c0d81f9cc04a34bd685c1cbfb1883a

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