Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c16d8df6bce95b…

MALICIOUS

PDF

267.8 KB Created: 2021-02-18 13:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1456c5944d898dbfa34d05c9a99501c8 SHA-1: ef1713fdd9d5bf95ea49e8a41f6492aad1123ff0 SHA-256: 09c16d8df6bce95b0688e27c557d5fa10519537687056987b6f40ab754aef635
116 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the malformed stream length heuristic suggests an attempt to hide malicious content, likely related to the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/wb?keyword=samsung%20xpress%20c460fw%20toner%20media%20markt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5ff9c0e155438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5fcef47389547.pdfIn PDF document text
    • http://shoop-fe.ru/capites_do_brasil_a_saga_dos_primeiros_colonizadores1tdrk.pdfIn PDF document text
    • http://samoe-samaya.ru/81417156663ncfmq.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/mamolotap-zotonabeguv-tawitudixatewip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5fe8ace512d5c.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/dazuxujepov/21794446.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/filezilla_portable_windows.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/jakexatagidusanurito.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/rapinawoxutiwofejozuvuf.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_off0003ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DDC2 6152 bytes
SHA-256: c36a2abaa77108250707c29aff83e5077b5465ac48ad0eda7a25f742c20233d3
font_01_sfnt_off0003f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F2BB 15560 bytes
SHA-256: 32ac141e39b2a1e1c1a1c770fb7f0245ed9dbf355683d0e2e88046fa92e97d2e

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