Malicious PDF — malware analysis report

Static analysis result for SHA-256 539c88f9495375aa…

MALICIOUS

PDF

73.6 KB Created: 2021-06-09 05:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9d17b4276e64eb8a4ce74fbad736eac8 SHA-1: 69b8cbe2ffd21287475d497c9a1559dd1db487b1 SHA-256: 539c88f9495375aa6c03547fc7773fa4c3fe6464cb7e348b7f90b9e4ffefad0d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/pbw?utm_term=hacked+monster+legends+apk PDF link annotation
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/xamimasirijuzafi.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/baloxa.pdfIn PDF document text
    • https://toxisejaris.weebly.com/uploads/1/3/4/8/134851702/8833805.pdfIn PDF document text
    • https://boxagotogod.weebly.com/uploads/1/3/4/4/134491964/b3bf2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6067e12265724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_605fb478c951c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5fed7ccb588e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_60651d44e2a0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fcc541020f10.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/681841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_6024a210b817f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5feb0d44eb51f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5fd2ffffc7cbb.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/bab09663-2698-4751-960f-adaec908a7de/how_big_should_a_2_year_olds_vocabulary_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8188d808-b6c5-46c9-82f8-ff02cc8c3588/how_to_gain_weight_in_7_days_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1409d498-ef8e-4314-bb2c-2fa211067c11/tipos_de_sistemas_de_informacin_gerencial_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385a3e7f-c3e8-472f-8e46-c8e8c18c99b5/air_force_1_black_friday_sale_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473ca9f9-fddb-4fd6-a200-c7c64980bb53/economic_skills_lab_table_talk_interpreting_data_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616fa9d2-cee9-46cd-84fa-16f71ba38acd/when_to_change_transmission_fluid_honda_pilot_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2025da46-ac8e-449d-b262-a9425ab3fe04/citizen_two_tone_eco_drive_ladies_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44bada2-ec39-41bc-aa10-8f6c2404d68a/43525944439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5d09ef-fd77-4b9b-94dc-692d41df9016/one_of_us_is_lying_characters_names.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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 5420 bytes
SHA-256: 5e8a888c01c705f5f9542ab838ec0d3c558c7a26495c1e77a0d12504a9ace109
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10480 bytes
SHA-256: 5277d687ff5386f06b57db17e8d22045f986f15d8572bd2d6b40837727e2d229