Malicious PDF — malware analysis report

Static analysis result for SHA-256 c725feaa4838cf11…

MALICIOUS

PDF

82.1 KB Created: 2021-07-17 00:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6f82ed3d45245c28c9c3f1514400c21d SHA-1: f1ad801b0a10243f7078e4e23ec831631b3d1480 SHA-256: c725feaa4838cf110224225633dec4057566b1537287f07cf24217aba95b484e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a PDF phishing trojan. It contains an embedded URI that points to a URL, which is likely intended to redirect the user to a malicious site. While the document body is heavily obfuscated, the presence of the embedded URI and the ClamAV detection strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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/mHcMeCcfVl0/square?utm_term=esl+report+card+comments+bank PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f09c7f7db9c748133c4a29/1626381439152/kinetics_first_order_reaction.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f12032e75c7a046d9c57a0/1626415154740/energy_stored_in_dielectric_formula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16640 bytes
SHA-256: 3fad7b9f844843b9f8f0d2606bde6bbf884956c0be6f94d18ae76a9c61693779
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 10796 bytes
SHA-256: cfbb039ff31659dd0c9e74d6df73b3919588704d7b3a86a8baaaaca57b55b302

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