Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3337e0768352cc…

MALICIOUS

PDF

74.8 KB Created: 2021-02-26 03:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0da75ef76668577e268ed76459e7f116 SHA-1: 2b0faaba6b688453135062e900b7b7ab0b18fd73 SHA-256: 2c3337e0768352cc7cc281639263f546266343036bb8f950e300fbe82b54a258
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to educational content ('Past perfect continuous tense worksheet for class 5'). The presence of an external URI and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jottigo.ru/award?keyword=past+perfect+continuous+tense+worksheet+for+class+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff637413927f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5fdcdc83a85ba.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jhcM7OT/piwufat.pdfIn PDF document text
    • http://ramosek.iblogger.org/govume.pdfIn PDF document text
    • http://wuvolubevozobo.iblogger.org/spelling_rules_present_simple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd665d225951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fcdcc590e7a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/99461686555.pdfIn PDF document text
    • http://makuwuwamev.rf.gd/pibobox.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_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 5384 bytes
SHA-256: e06f620778a595dbfd6aeecc2face3052a63ecbd2b9cda0fa3048830cfa66631
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 9972 bytes
SHA-256: 827478c8858a9bbf6bd06731302c187eeca5320e00117f2ddd32682b215b74ec

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