Malicious PDF — malware analysis report

Static analysis result for SHA-256 c477535b9bb17ce8…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 23:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a9259cc8de28c40087498f52f55fb91 SHA-1: 267114b1436a3e4cb0ba56bfa08e293c9bc43981 SHA-256: c477535b9bb17ce8a69ff416ee5af7d9957b3dd9d5c9dddfffc6eea0468728ef
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV detection and the presence of embedded external URIs strongly suggest a phishing or malware distribution attempt. Although the document body is heavily obfuscated and unreadable, the heuristic firings indicate the PDF contains links to external resources. No scripts were extracted, limiting the analysis of specific malicious behaviors.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2687

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/iCUEKX862tE/square?utm_term=how+to+get+quotation+marks+on+keyboard
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec737f8300fd66e1948d9b/1626108799836/american_english_examples.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e771e3a497014f3d5a1292/1625780707245/acsms_resources_for_the_exercise_physiologist.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf2a.bin
fa5eb5236b1e2af0c53a9e97c12667955d5a6353441f7905e0d3e0b3f311b1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 17520 bytes
font_01_sfnt_off0000ecd6.bin
4c78651dd6a20f582358743bf213a5a850acff3d2b36b896d18a7493894f3d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 11216 bytes
font_02_sfnt_off000106a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16792 bytes

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