Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43a569e334814d5…

MALICIOUS

PDF

85.8 KB Created: 2021-07-15 18:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef6267fbb8a5de668bda7ad87b763fb4 SHA-1: 299deed4dec7cf52bfdd275ece6fcefe81cea4b6 SHA-256: b43a569e334814d5bd01b82fed9ceb30ed639c35f5d2676f6f57a19804dd5ed4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct users to external content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection indicate a phishing or malicious content delivery attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3814

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/WVKuihPcy9U/square?utm_term=syrup+for+baklava PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9447b6e267257943beeba/1625900155832/ss8h3_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee90526d75c50a5d483400/1626247250509/95426361588.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee4b242a4cda17625ee970/1626229541040/wexageluseko.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee1806f6c772366d2b1b86/1626216454892/novel_the_fault_in_our_stars.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16992 bytes
SHA-256: 10c5f9ed903c7145213dd5d0548c46f8d1fcbb5ae42bf56ce78e91dc58681d99
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 17432 bytes
SHA-256: 44cc9a9ecccbbe72523479d4da184e32420ac1d2ece2b813954601873fd1664c
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 10344 bytes
SHA-256: 44a02a3f266ba046f920c330a2780d187bac8afeabce38f38be5459791d30247