Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b575c73a733c898…

MALICIOUS

PDF

105.3 KB Created: 2021-01-24 23:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5f03f8ee9a2391df2a73311e15272b80 SHA-1: e34c96ad5a33bc9e1b67a819cfa49622a0097a33 SHA-256: 4b575c73a733c89862507dc649222fa1ca0d055b49bd884f41bb287d1a250ad5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a malicious website. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing or credential harvesting attempt.

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=purebred+and+hybrid+organism PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fdddb5e5c795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_5fe1289568a68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_60082c7414a77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbd70b14e2f.pdfIn PDF document text
    • http://zowomojagobipur.iblogger.org/scarborough_fair_harp_sheet_music_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5ffcbe79abd55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetijub.epizy.com/contango_holdings_plc_annual_report.pdfIn PDF document text
    • http://zifezerolivuba.epizy.com/pre_diabetes_diet_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/assamese_poem_image.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/rsync_command_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/bony_to_beastly_workout_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/9642462398.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/3340238643.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/year_three_division_worksheets.pdfIn PDF document text
    • http://fanurumuge.epizy.com/39736734813.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_off00015d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4D 5448 bytes
SHA-256: c2b3e767c48bbed44131f4288ba9d18e41f43c8fba773bf9405cd2c38cf924a6
font_01_sfnt_off00016fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB3 12588 bytes
SHA-256: 485294075e9c3801d9da88ebe909cfa0649073a5db0bad8cbd6ad62f7e5f21de

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