Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac347a6c8869f0b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-14 09:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f2248736c729a9e428d1aa90a42ad75 SHA-1: a15da815069daa7c9e17ec4294f511b65b83bf84 SHA-256: 4ac347a6c8869f0b15ccbec1fc30f817f36a2fded33b9e5c0dd4ffef18f6b3fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although currently flagged as benign, suggests a potential phishing or credential harvesting attempt. The PDF_URI heuristic points to an external URI, which is a common technique for delivering malicious content or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/rCno-htTzZk/square?utm_term=out+of+the+blue+azores
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8faa8c22c005c933712cf/1625881256585/99342946018.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79a68d0799e4214bcd942/1625791081027/move_to_word_document.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee53e17426fb5109f632e0/1626231777931/how_many_types_of_joints_are_in_the_human_body.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_off0000c57d.bin
35fa7f9df8ba063c5cd901cb9fa542860226ff965fe818004f2183b42ef06541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 10440 bytes
font_01_sfnt_off0000dd6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 16792 bytes
font_02_sfnt_off0000f57e.bin
66fed7e57fcaa9ddf927c58e8855b6e4ead46e9967a0366e1a731d0059d53c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 18360 bytes

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