Malicious PDF — malware analysis report

Static analysis result for SHA-256 8221122b9f66a87b…

MALICIOUS

PDF

67.7 KB Created: 2021-02-12 22:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 27210962bc98ce4855d24adedfc5c76b SHA-1: 28631064c7eeb8cf02f860ab5e462c4e47ed0e3a SHA-256: 8221122b9f66a87b5dc7e79e3019311a17f0421253a4a54267e92a8855e4856a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'https://leonvi.ru/123?utm_term=world+thinking+day+2020' was extracted, suggesting a phishing or malware delivery attempt. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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://leonvi.ru/123?utm_term=world+thinking+day+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fccb8cf9f6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600b106e512b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_6006a15bb2f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_6013c2bb159c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5fce460657fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_60207da0a610a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_6002727243502.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ff75a478affa.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/juliziwojatige/potoxusugidarilagozufagi.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/car_air_conditioning_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/41985304416.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/85997727466.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/tavapigexonedazabeguj.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/free_clipart_borders_and_frames_s.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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 5364 bytes
SHA-256: 9006420662f67f2c81d4ba69388c286e53dadd3cacc2bf3f0bad3472c193d1a2
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10220 bytes
SHA-256: c33c2550db7d81639861686b8a0e22255dd43d6252a98a18d64e7d2df797ca06