Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a9c822438590f…

MALICIOUS

PDF

63.7 KB Created: 2021-02-23 21:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1cfafad58fb1af8791508997d7150c7d SHA-1: 56da130f9cec996fa3112d9f42c05a5ab0623452 SHA-256: a43a9c822438590fc95cac22727b4ace186ed0eff8cdd1c926f1239ab8018a5b
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This, combined with the ML classifier flagging the PDF as malicious and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded URL is likely intended to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=computer+organization+and+design+3rd+edition+solution+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_60180670cc1ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5fc8c8c83e479.pdfIn PDF document text
    • http://creampiepow.club/admission_form_of_sainik_school_tilaiyaz348c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_60158fa1e8561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filopatoj.rf.gd/72526213275.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/65218550543.pdfIn PDF document text
    • http://lomuwobutuwadim.rf.gd/16236264114.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/20295398998.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/tower_defense_mod_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/accounting_cycle_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/caderno_quadriculado_japones.pdfIn PDF document text
    • http://tewejifofobaj.rf.gd/senix.pdfIn PDF document text
    • http://wifavar.epizy.com/free_chicago_apartment_lease_form.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/towewepuviw.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/haryana_sports_cash_award_form_2017.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_off0000bb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB50 5480 bytes
SHA-256: 6302c8815a3f763c7f41f7d6601662b7d6821b5af0c7ddbd1513e28784b583c8
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 10452 bytes
SHA-256: 7092fe58194470485f9b8cd4d897c28ce3e071c9c728e24e210060e8c5c7a4e2

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