Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8350e76638902fe…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 17:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c830524f47e8351cfd6f9bfe29df86 SHA-1: b04f1eecb1e66efa01eabf99f03c54e6d99e26c6 SHA-256: d8350e76638902fe0b950f21b7548d4aae0ef3550e02c11f500e653f2bfe891e
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is presented as an "international finance degree" link. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=international+finance+degree
    • http://huaweistoreukr.xyz/star_delta_wiringnq02q.pdf
    • http://zomesotemaxage.66ghz.com/building_bye_laws_nepal.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_605f83ad6b017.pdf
    • http://acupofjacob.com/38457354956a7soh.pdf
    • http://remontnatali.ru/drdo_ceptam_notification_2019nqsmc.pdf
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5ffbac8ea8c6c.pdf
    • http://guromufupadaf.iblogger.org/78142150387.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_605a03d6430c5.pdf
    • http://wamikesaximilub.22web.org/funny_answers_for_how_are_you_today.pdf
    • http://d2-club.ru/maslows_theory_regarding_needs_and_motivation_for_educationuh2wh.pdf
    • http://baltika-trans.com/14086497023jh959.pdf
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6046be857d558.pdf
    • http://retys.space/60719467405qte43.pdf
    • http://hookup756.fun/grid_computing_definition_in_computer_science8cwe0.pdf
    • http://site-shop.xyz/tegosasazepugamikumaxlpt4y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/636f3979-1722-4941-bd1c-f2981916a4e8/section_138_of_negotiable_instruments_act_latest_amendment_2020.pdf
    • https://uploads.strikinglycdn.com/files/a321ebb9-98b9-4f70-a575-d8cf8ded92fa/james_patterson_book_in_order.pdf
    • http://weralawubuzeg.epizy.com/talezakasulof.pdf
    • http://lozekav.epizy.com/chickpea_seed_production_manual.pdf
    • http://regujivabi.rf.gd/malayala_manorama_calendar_2020.pdf
    • https://uploads.strikinglycdn.com/files/e584860a-9f7c-42e9-9d90-8f8bf7749a8a/boy_scout_store_houston_texas.pdf
    • https://uploads.strikinglycdn.com/files/fd2ab692-274f-437d-8089-aea107354df5/mosusik.pdf
    • http://sokajifaxi.rf.gd/toa_at_4060.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e998.bin
5f3ff9617e1d0f7da8bc166a6446c3001d57260caa91d02d0b434eceb6d9d8f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 4948 bytes
font_01_sfnt_off0000fa7a.bin
b10ae2b8f16e67b412656cfbd0747f835a0c18780efe8759aca9b33bed8ba105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10328 bytes

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