Malicious PDF — malware analysis report

Static analysis result for SHA-256 361a16432e13bcdd…

MALICIOUS

PDF

65.4 KB Created: 2021-03-17 18:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f31497f71bcdc5c2fbfd4e1619c47e SHA-1: 548a6e61e3f3bda14ff597a95f835e6fcaee5584 SHA-256: 361a16432e13bcdda8168976f9c042918bc56a8504ef01281000a3c7fafd836f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=sparknotes+macbeth+quiz+answers
    • https://cdn-cms.f-static.net/uploads/4457854/normal_6020c26c04866.pdf
    • https://cdn.sqhk.co/navimoxa/hXPhgKW/gaga_live_video_chat_app_mod_apk_download.pdf
    • https://cdn.sqhk.co/zajikeze/ahcib2U/cdtfa_sales_tax_form.pdf
    • http://adyga.site/82939534210swfab.pdf
    • https://cdn.sqhk.co/pelopuxi/NuYysgf/purizabolurosajatulodij.pdf
    • https://static.s123-cdn-static.com/uploads/4468553/normal_5fe26fcf93b5d.pdf
    • https://static.s123-cdn-static.com/uploads/4409256/normal_6003992271469.pdf
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ff68ac10763e.pdf
    • http://natnat.fun/pubujonusurofk7c16.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_603ea43fb13b5.pdf
    • https://cdn-cms.f-static.net/uploads/4483361/normal_604ddd4c6e0ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f6d99f8-9f50-4576-a315-28d1053a2d77/lixijusabamalavufejem.pdf
    • https://uploads.strikinglycdn.com/files/9e27fa17-1d9b-464d-9b96-0a1431a7a717/wildgame_innovations_mirage_ir_18mp_game_camera_reviews.pdf
    • https://uploads.strikinglycdn.com/files/688340b3-39e3-406c-9792-d26bbe449a0c/how_do_you_disconnect_a_hard_wired_smoke_alarm.pdf
    • https://uploads.strikinglycdn.com/files/2c9110b8-4046-446e-b2be-28c282d7f79c/68149118134.pdf
    • https://uploads.strikinglycdn.com/files/01c60f0c-7bd1-40f2-ba02-e765902f1147/why_is_my_hp_deskjet_2540_not_printing_properly.pdf
    • https://uploads.strikinglycdn.com/files/9d3b29e1-95f9-49b1-a82c-8848d56521a5/74166611101.pdf
    • https://uploads.strikinglycdn.com/files/219cb15f-1006-450c-ab53-88fe9746314e/32786272568.pdf
    • https://uploads.strikinglycdn.com/files/4f9c8720-605d-4659-955a-ef5dd10143c6/j_mearsheimer_the_tragedy_of_great_power_politics.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_off0000c35b.bin
24f9e3cbbd586bcf855c1196061298c0de3e76f7b77ff3ed47fd197e668f6de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 5716 bytes
font_01_sfnt_off0000d6c6.bin
fbf55c00d186f704e39f07e12debcaffc4aa6764504e6700990f9f0fdcefa993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 9864 bytes

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