Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d91127b573173…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 19:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc699ae2e171dd275b9d7e006d415ccb SHA-1: 9c7483958263b902d83d15380c9c25b3fe1c6100 SHA-256: 4b8d91127b5731734166c385d0b64d729a521f4e99a1778e37f6747ef28b06fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically one pointing to a feedproxy service, suggests an attempt to redirect the user to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are commonly used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/gOBB6uaVNRA/square?utm_term=plump+and+sexy
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfc058f209f4d8287275d/1626209285218/44447241058.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7c2337be683581ce160e2/1625801267939/mamid.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecca03929f7b3a9fe1a72b/1626130948028/981427364.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_off0000c9de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 16792 bytes
font_01_sfnt_off0000e1f5.bin
9e7aef77f7c83a1a9b9b3c1189d1bf8e1f0005da2b0f4a4a7185670df300f845		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10460 bytes
font_02_sfnt_off0000f9ae.bin
ee3a5212c118f76e8942475747bc08822e4f24c8e17b5a9027d88eb94f1037e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 17376 bytes

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