Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff2ac9ea1407b2c…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 07:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef63288c18408cffe1de272bf21649e5 SHA-1: d23eaab35fb9258a1795ca46e91aad8f92c91319 SHA-256: bff2ac9ea1407b2c21e174d02aab978f462124ac3496768ceac98cb4e1ec7a30
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to zajinet.ru, which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, contains text related to 'simplifying expressions worksheet 7th grade', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=simplifying+expressions+worksheet+7th+grade
    • https://cdn.sqhk.co/lusesito/sZjaTjg/brs_parachute_retrofit.pdf
    • https://cdn.sqhk.co/texojijoraso/hdgfcgi/ants_in_plants_control.pdf
    • https://cdn.sqhk.co/mowibani/dVgi3ge/malokilujego.pdf
    • https://cdn.sqhk.co/ketejeti/haijyKg/pocket_watch_drawing_step_by_step.pdf
    • https://static.s123-cdn-static.com/uploads/4367296/normal_5fff2e7f341e6.pdf
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc752a5ba0fc.pdf
    • http://nupamimebevoz.iblogger.org/xopimupegodab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a40e9111-0257-42f0-a8fb-fb42739ea759/preposition_worksheets_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/252cdcfc-176b-485a-ad72-a110d1e6ddbd/deadline_to_respond_to_a_motion_to_dismiss_in_florida_state_court.pdf
    • https://uploads.strikinglycdn.com/files/1835e3d1-f813-4a44-ae27-b1be36d5b85d/16671945506.pdf
    • https://uploads.strikinglycdn.com/files/00ce1571-7ffc-4302-9be2-88b6cf635a0f/ramen_noodle_cookbook_amazon.pdf
    • http://vavoxixe.epizy.com/mekafunolaxiwuberul.pdf
    • https://uploads.strikinglycdn.com/files/b8fd64bb-09b6-4d04-89f6-d6c91ff3855b/63256215190.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_off0000dccb.bin
dfefd9cebf5188e8b864b271801bb7d953a3de075c870397f065f266541611f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 5964 bytes
font_01_sfnt_off0000f117.bin
618d25023ce64d6a1cb10f7f62dff0ffc857e9582ef7dc43ed0361b5110ce49a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 10816 bytes

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