Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91d57d88a7b878e…

MALICIOUS

PDF

76.9 KB Created: 2021-07-13 11:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e74c144bd809b125755d7e44e8b30e0 SHA-1: 9bb8fa757652e614b8afe31b576c4e3f9f4d0def SHA-256: f91d57d88a7b878eef6e33d614902c292ba6fcc13e2746ac9a03c55f6b1f9e1b
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 appearing benign in reputation checks, are presented in a context that suggests a lure for downloading further content. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=word+to+pdf+converter+for+windows
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93d0c5ebba154a8fd2acf/1625898252971/pvp_arms_talents.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec85a05f604029b991c1a6/1626113440799/simplicity_cribs_instruction_manuals.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed2b46cdb2ce13c523802a/1626155846312/top_10_strongest_military_in_the_world.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca9678c19ad4998dea383/1626122599430/kubudamof.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed151c3b21860fe66d45f2/1626150172355/pituitary_adenoma_homeopathic_treatment.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_off0000ca4e.bin
f2bdf86a3741112620b00c52ac9a92c52b8bee657927d3f374e33d2973f54c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10552 bytes
font_01_sfnt_off0000e28e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 16792 bytes
font_02_sfnt_off0000faa0.bin
ae207779e393b395da00a0757c01f98323acfb39ab5e20b43bb0c5904c5b27bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 17384 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.