Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f786eba50295a9…

MALICIOUS

PDF

85.7 KB Created: 2021-03-22 11:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c439545ed6d97d3c1c1c2cb00b149c0f SHA-1: 89254e555377bc308d5da91024b314817c878687 SHA-256: 97f786eba50295a99e375413d7e186fa3e14bf10e1a5264de26ef6f19149318d
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the high risk score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/aws?utm_term=sansa+clip+firmware PDF link annotation
    • http://vozivovog.scienceontheweb.net/28550558890.pdfIn PDF document text
    • https://cdn.sqhk.co/gugexuje/ijztVij/i_love_word_to_excel.pdfIn PDF document text
    • http://registrat.space/lunastra_field_guidej7nwa.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_to_calculate_the_moles_of_each_element_in_a_compound.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/gubopigejazoturewisoziza.pdfIn PDF document text
    • http://topplafond.xyz/which_of_the_following_is_not_an_example_of_general_deterrencev60aw.pdfIn PDF document text
    • http://ingmijn.com/jutasazo516c2.pdfIn PDF document text
    • http://osummer.space/probability_density_function_pdf_and_cumulative_distribution_function_cdfhs5dt.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/rhfgjif/gt_racing_chained_car_stunts_mod_apk.pdfIn PDF document text
    • http://lakcherie.ru/wirobuxirotosoxizitaruba41.pdfIn PDF document text
    • https://cdn.sqhk.co/tesosunimew/a8tRibw/zejulosivesujiguful.pdfIn PDF document text
    • http://doucheop.xyz/what_is_a_functional_analysis_in_psychologyrfa4t.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/6iegcaO/aladdin_king_of_thieves_dvd_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_66ffe81a808248e5b2498415494d35a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/483427eb-ec3c-4e47-b5f6-2f354695529a/5319333049.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_ee6e6c35ce2345879cd97db0763d9192.pdf?index=trueIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_ffb29940b11c49a7afeecd1e09aa6545.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c86327f-6707-49d8-90d8-f66720f27359/britax_advocate_clicktight_airplane_installation.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_f714f0a0f292404287f93e17b1ee5558.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_eab5c2d91039470c828e4784f3bd2c58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8538e80b-0bc7-4049-9aff-26ecf24eaee8/94508404955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7bac50-a660-4b3f-9781-409fd068b902/25648098370.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/vaxelinevazaruna.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_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 5356 bytes
SHA-256: 4e1cda6a495f8f50fc63e239b137a70254baaaad7811b6042452473a716d7682
font_01_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 11560 bytes
SHA-256: b150eccbd346b70eb4f3b6a35c06daf8a9f5aa560a7d4e559595234e6c4e32ec