Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8510b7e50779e6…

MALICIOUS

PDF

74.8 KB Created: 2021-07-17 00:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e592de9978b92ad03251643e0e66eb8c SHA-1: c349256de14d1c96a6e931805ac4ca1b0fa6b549 SHA-256: 5f8510b7e50779e609957f7fe083c0ed02ca52002719a748c0c5a75b27ea1763
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded URI pointing to a download link, disguised as a resource for a technical book, suggests a social engineering tactic to trick users into downloading potentially harmful content. While the URL itself was labeled as benign, the overall context and detection heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6911

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/~3/9xivtwLAy4k/square?utm_term=download+cracking+the+coding+interview+6th+edition
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca43790a3fc49531c5fd9/1626121271481/papemodugogokuvebokik.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1f6207c06d275666c35a1/1626469921007/odessa_catacombs_map.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f02d027fedc2490c0c7eae/1626352898709/fast_and_furious_7_total_collection.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd73130d23a75506287ad/1626199857126/pregnant_dog_eating_grass.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_off0000bfbf.bin
15c389e08f8b6d5f49a956f00c0b890ec602b471b78eb68dcfb7047fd4a0bfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 10892 bytes
font_01_sfnt_off0000d8be.bin
8b84946dc25732ace8e50aa793313ea55e0f18526856fd73e9b496faa48c93f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 17844 bytes
font_02_sfnt_off00010544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16792 bytes

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