Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70820883d710d59…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 13:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63eb6f8f0f62aaf800660ee1d4ff930 SHA-1: 1fe0ed06175f1450188e9fc427701c06a769a953 SHA-256: b70820883d710d59603d300d63b1502830500b72e3b561a0bf5d7ab9ced1dd96
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 embedded URLs that, while some are marked as benign, are likely part of a lure to direct users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the overall indicators point to a phishing 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://feedproxy.google.com/~r/sq/ugae/~3/gPkW7oTCsL0/square?utm_term=closed+for+inclement+weather
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee5b1f07d0587a37650ba8/1626233631417/how_to_screen_record_on_iphone_xs_max.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edc3d077fc8e778b5498aa/1626194896878/primary_care_optometry_download.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f13786e7c7822395896252/1626421127043/fagikurerobojitirikezafaw.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7e66950202184f1004a4/1626111590808/gemuxegaxubokodovuzo.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93ccae51f1f218d6ae073/1625898186312/silent_hill_games_ranked.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_off0000edd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
font_01_sfnt_off000105eb.bin
16ece53406eecd4374069f07bfbdcf51b962a8ffa5322ef6aed14b5d44498312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10860 bytes
font_02_sfnt_off00011edd.bin
04cb2bb5ab1527ec2820b68185cd43e4211e179bbdabdf71094b2f985ff7716e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16752 bytes

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