Malicious PDF — malware analysis report

Static analysis result for SHA-256 616853b52d1bf739…

MALICIOUS

PDF

83.8 KB Created: 2021-03-30 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772ecb05f1e9a802376c278cc34901c2 SHA-1: d4ec79e1b35608356ca013c651880f07b516d473 SHA-256: 616853b52d1bf739a8c575205f23e7d89859a8aab1aa69ac1579672f11cf9291
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'druttle.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of a malicious document, likely delivered via spearphishing.

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://druttle.ru/award?keyword=greenhouse+effect+worksheet+pdf
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/wewosumo_pomudubo.pdf
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/f5afeea4a.pdf
    • http://grandov.pro/25003364081wpawb.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_6019144408f1a.pdf
    • https://cdn-cms.f-static.net/uploads/4500187/normal_602c5c1dccb59.pdf
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/132375.pdf
    • http://winoraama.website/restatement_second_of_torts__46rlfkj.pdf
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/posupizon.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fd2d7fae7077.pdf
    • http://modebedunizux.iblogger.org/encyclopedia_of_buddhism_malalasekera.pdf
    • http://andyhongdigital.com/dc_comics_wiki_lucifer15wqm.pdf
    • https://static.s123-cdn-static.com/uploads/4420910/normal_5ff02ee5a60a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a8afd56-f853-4fd8-9b5d-b231cf73d6e5/chevy_s10_wiring_diagram.pdf
    • http://xexojonorowo.epizy.com/49368631474.pdf
    • https://s3.amazonaws.com/votawawo/warcraft_3_reforged_mit_frozen_throne.pdf
    • https://uploads.strikinglycdn.com/files/ad892f65-160c-4f43-8959-d3f903a346fb/la_metamorfosis_franz_kafka.pdf
    • https://uploads.strikinglycdn.com/files/bf343104-e7bf-42ed-83d4-6038d7328b96/31563050180.pdf
    • https://s3.amazonaws.com/kubafezin/18876878252.pdf
    • https://s3.amazonaws.com/biwubeleba/33792125133.pdf
    • https://s3.amazonaws.com/mejigavukolu/10111874569.pdf
    • http://talanobu.epizy.com/sample_interview_questions_and_answers_tagalog.pdf
    • https://s3.amazonaws.com/divelatoxa/semesutogozelajezufavimip.pdf
    • https://uploads.strikinglycdn.com/files/181a45f0-31f5-4fb3-8e10-e1895c9aa2c2/fewexapudufodoke.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_off00010880.bin
6b50686a02f7c544cb424548bae5ca4e3c6d8268fcfc99b546c499bb19448aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 5188 bytes
font_01_sfnt_off00011a3d.bin
ab9da12f5362b50ced4aec0f7eef389b61c64b1e8bf2237c0344d9c268ab25fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 11592 bytes

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