Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11dbfb6b61311c7…

MALICIOUS

PDF

75.1 KB Created: 2021-07-18 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 785ecd987893f358b741534974049b5b SHA-1: 4ecfadf30d49fbcfbb9a496f757f701d0f1c35e1 SHA-256: f11dbfb6b61311c7b4385b4cb77519fbfa6b0e7c041c396c8b343a3afacc1ba9
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, one of which points to a Google feed proxy, and several other URLs related to Squarespace and RDF/Adobe namespaces. While the document body is heavily obfuscated and truncated, the presence of these URLs and the ClamAV signature suggest a phishing or credential harvesting attempt. No scripts were extracted, limiting the analysis of specific malicious behaviors.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/XMoLd4EPXkg/square?utm_term=the+best+conductor+of+electricity
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1d7c2eb3ec5725aeb97c3/1626462146353/osmosis_and_diffusion_lab_with_dialysis_tubing_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e796715c13cc4fede6c13b/1625790065308/76584422704.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_off0000c374.bin
58eb5bdf16d377ab6aa7cebc7b6a736e27521ae812ca71c21cb50a155e6adbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 17092 bytes
font_01_sfnt_off0000f022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16792 bytes
font_02_sfnt_off00010839.bin
b3008bc7403602f638cc162a3b3ca2fee41e0b8fe7d62512cdcb21a76d6a3e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10728 bytes

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