Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ace4898f1506d9…

MALICIOUS

PDF

76.6 KB Created: 2021-07-17 14:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3870c616dd625d26a6159be87b508b84 SHA-1: f2493e7c52b67aa60f32ea5e1568ceddac565682 SHA-256: 28ace4898f1506d9b9f3f94dd14ca05d488f1b94910a8ac2780589f877a7bf79
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains an embedded URI that points to a download link, suggesting it is used to lure users into downloading a secondary malicious payload. The presence of a 'download button' heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pL_UGxDroB4/square?utm_term=download+8+pool+mod+anti+banned
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f25899bb7e64222dee4827/1626495129770/91972227355.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edf8337ce58f02ed967cdf/1626208307156/day_adventures_near_me.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f298db1434f635471becd0/1626511579532/xovazozesigewuvevixivi.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7bb0c95719b356d9135e2/1625799436468/china_aerospace_science_and_industry_corporation.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0046191893d3c0395cfb6/1626342497595/4451723587.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_off0000ca1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 16792 bytes
font_01_sfnt_off0000e233.bin
c6a4941db0ceccc1eaef8213c3a2441f0ec4eeaf0ec36cd71431caee5c557916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10720 bytes
font_02_sfnt_off0000fa94.bin
f7f3085267328f4a41637137476ac5d843a076bff542cd70ebfe56f5ff58ae74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16752 bytes

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