Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ffb635fada5271…

MALICIOUS

PDF

90.3 KB Created: 2021-07-13 16:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f4caf933454b416a97b3bb790a713b SHA-1: c4e48a396de768c6d4746cd0a8be29b1864d9275 SHA-256: 29ffb635fada5271db1ebe215bf20a8c6dea5d738211c48751bcaabfc6a3d711
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which is associated with a search query for 'prepositions exercises pdf with answers', suggesting a lure to trick users into downloading malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

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=prepositions+exercises+pdf+with+answers
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e86e647f3c8a3985b68743/1625845348779/bojuribijowa.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec85b65978cb5ccaab0c13/1626113462494/gizotugifu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8ac69c2f4e855af97706b/1625861225665/what_are_the_stages_of_policy_making_in_healthcare.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec96193080d76c7a5252c1/1626117657080/wind_and_rain_sounds.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_off000100d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
font_01_sfnt_off000118e5.bin
e8bad9ec576b702193feb205337e1357e8317a99758861c6a235f6965a6b75a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16868 bytes
font_02_sfnt_off00014456.bin
c9418393bf1c13621d63e78e71c5b1b29329aa8a1fa82858d5d7d9f574f81760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14456 10860 bytes

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