Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd849d8c47501764…

MALICIOUS

PDF

84.8 KB Created: 2021-07-15 11:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbeb014df63747c4e2986ed0fa269ccf SHA-1: 5b5f9df08bfd8961ae747832261360701861ff60 SHA-256: fd849d8c475017644e729bee016c3f107fbe89d6be89317e9c323b05bb0c5124
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://chcial.ru/square?utm_term=function+of+demography', which is likely part of a phishing or social engineering attempt to redirect the user to a malicious site. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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://chcial.ru/square?utm_term=function+of+demography
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8c0c63e8238298acc4cf5/1625866438525/knee_replacement_types.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec89370cf33f708d7aff2d/1626114359565/the_time_for_earth_revolution.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee60b7eed6cd77ab64166b/1626235063260/old_crow_antiques.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e929408fb24157da705c13/1625893184933/helmholtz_watson_character_analysis.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e870c28f543d48c8825bc3/1625845954494/michael_jackson_and_taylor_swift.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_off0000ea80.bin
07cca300a3ccf9df5646e4726a4707a170e012044dd421eead6a8f9f68bd2e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 11044 bytes
font_01_sfnt_off000103d0.bin
17c9992d7e0dd1aa0a0639cdc1823c72e8a8ede6a33f928e8cad0ff3920acfaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 16792 bytes
font_02_sfnt_off00012fa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 16792 bytes

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