Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5aa256dadaadf1…

MALICIOUS

PDF

78.4 KB Created: 2021-02-21 01:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 666fda673891678e526723cf550a3605 SHA-1: dd141bd955cbaf40088f0ccb931488868d631953 SHA-256: 3d5aa256dadaadf1a87d5196bef2de80ac5819e8792d46d42ee34c93a3263252
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to the URL's query parameter, suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a malicious site for further exploitation.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=how+much+do+indiana+foster+parents+get+paid In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6010a83356ceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_6002df8196a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_6013bcde798b3.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/gdgheib/bavusunukaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_5fe73b5b4e458.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/KQNjjjf/venufesazemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_6006683c263b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_6009f1f307bc3.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/kotidox/46339213921.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/philips_respironics_system_one_auto_cpap_manual.pdfIn PDF document text
    • http://gezuvemun.rf.gd/antihypertensive_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/database_administrator_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/ameloblastoma_plexiform_histology.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/mozart_piano_concerto_17_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/82384036731.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/rakis.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/beponizilisijatabegeme.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 5588 bytes
SHA-256: 041e416d8dab4b062647a98f492e74c3b45760efe9aabb6d288ca1245eb9daf9
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10532 bytes
SHA-256: d895cb07b3abeb56770118930cc372a35e488b3d9f00671fe56014f37328f845

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