Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e8370d07cfc4c7…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 12:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 414b5b9104290d1dd35f5756c5ec8ba8 SHA-1: cbfeef172d7065b9178a1d7394e405b5f45e8a2e SHA-256: 27e8370d07cfc4c7176443f84b1eb0aaf48ebb634bedde426312fe46d45fd074
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious external domain. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be related to job searching, a common lure for phishing attacks. No scripts were extracted, but the presence of the external URI is a strong indicator of malicious intent.

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://vilenefex.ru/strik?utm_term=how+to+find+remote+software+developer+jobs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485440/normal_60070da983d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_601e6e8b74d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_6010e1ac35f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fd27b25b999d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_600a438da517b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6021544e8981b.pdfIn PDF document text
    • http://papotupeti.iblogger.org/27508440433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467936/normal_6002974f528ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5fe1c87f83b8a.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/medaliwifufugel/cache_size_cpu_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/8311634768.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/chinese_learning_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/free_netflix_video_er_online.pdfIn PDF document text
    • http://zabetexukiked.epizy.com/google_drive_calendar_template_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/historiette_no_5_sheet_music.pdfIn PDF document text
    • http://kunonepu.rf.gd/bowuxijogonidunutewi.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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 5516 bytes
SHA-256: 99916b5a687b1fb5e0da583ae2421111015c398271b0c9bf410efc3bc28e74d0
font_01_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 11464 bytes
SHA-256: 93c17dc9d2b6cfcff606eb5b77046f3e38aa30c593575413436a429d38588f00

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