Malicious PDF — malware analysis report

Static analysis result for SHA-256 58882b7716b91c89…

MALICIOUS

PDF

66.8 KB Created: 2021-03-10 02:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5bc9d047e7d47ba7a74a4b4069015d91 SHA-1: 2230060ebbd6fbfaa6bc18464bbd7ad9aabc7707 SHA-256: 58882b7716b91c895c6e5067358265c9ef8e00f2b96cb75e62d28537a7fea035
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'bologen.ru', suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The document body, though heavily obfuscated, contains keywords related to academic subjects, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=finite+element+method+nptel+pdf+civil PDF link annotation
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/bevelojanujevetijuk.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/moments_skewness_and_kurtosis_in_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/bxzgdfL/6977930319.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/BTjfzje/lamoneludawovevos.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/8699900.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/OjgTh6E/54251990176.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/3e3f6301e9.pdfIn PDF document text
    • http://mojikinewosak.22web.org/how_many_calories_in_a_dunkin_donuts_iced_caramel_latte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/form_to_apply_for_american_passport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d58e2f-db79-4429-ad11-e95a6f1660e1/12499709485.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/autocomplete_textbox_in_asp.net_core_mvc.pdfIn PDF document text
    • http://mukowepefirufeg.epizy.com/hbs_1120_review.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/alfresco_community_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636cf4ea-ed14-4030-92db-30a1d3f60258/xerox_workcentre_7845_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cedb66c-6e61-4260-830d-b88416b7d88c/69452289593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939c9e75-c863-4d5b-a576-074a0e020c06/zekuzolurapinivira.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jogos_para_pc_fraco_windows_7.pdfIn PDF document text
    • http://dafukip.myartsonline.com/vanosazubuxaxesuni.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_off0000cad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 4928 bytes
SHA-256: 334e6660fc092bdc168339c7a7c0f4d7dae26543385ed5dc15b91db732985fc2
font_01_sfnt_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 10236 bytes
SHA-256: 2a58396a833a0a9cd9383c4550649057ba504a2629784529306ac6a3be0475f9

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