Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1bc4c2415a1213…

MALICIOUS

PDF

104.9 KB Created: 2021-07-12 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b19554ae3eb0370a3fda8e8f9bb87ff5 SHA-1: 29e57248f341116da621f5b9fd4b9b452d97279f SHA-256: ce1bc4c2415a1213435dc71edf34b17b5b118813b363cd8a56790196b60df839
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. It contains embedded URLs that, while currently flagged as benign, are indicative of a phishing attempt. The PDF structure itself is unusual, being generated by wkhtmltopdf, which can be leveraged to host malicious content. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3225

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://feedproxy.google.com/~r/sq/ugae/~3/7R6buoffwiA/square?utm_term=what+does+cuarto+mean+in+spanish PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e898571534e367035353fd/1625856088098/systems_biology_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec834e668ba31612b6065e/1626112847046/wsdl_to_java_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8467d0153e73bf8be526/1626113127648/lobsang_rampa_the_cave_of_the_ancients.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec794aad1bf7105ccad11a/1626110282189/ximagavexilefuwo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 16444 bytes
SHA-256: 8ae84c7b98dd32b1eeaea15851f305d19d653c1e20991e9a3877098ecb715807
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 24276 bytes
SHA-256: 6c5a7599827962432d4e6f1ba9dbd65bf23ef38cf1090fe879a1c358cd9fa669
font_02_sfnt_off00016677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16677 10824 bytes
SHA-256: 9d8391f5e5ac75621b316c4f64d0269e011db1fa2998717613d3db7abdd28fe3
font_03_sfnt_off00017f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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