Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bf4eb9dfe7e913…

MALICIOUS

PDF

73.8 KB Created: 2021-07-18 07:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d14f62dadb47d923c5fe5d881b3e435 SHA-1: edf5df5bcb3808531717c42ff6e2797678ed6513 SHA-256: 52bf4eb9dfe7e9131e27421cb2c97d900352a457a0d79bb5a2e5eb731ea053c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, though marked as benign, suggests an attempt to redirect the user. The file's structure and heuristics point towards a phishing or credential harvesting attempt, potentially leveraging embedded scripts to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=extraposed+subject+noun+clause
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c9f3e1e3555a32468f1f/1625868787082/side_bangs_for_round_face.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d2b154da9c6696c591a2/1625871025116/south_african_beat_style_mp3_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1a536f02870410043a5a9/1626449207086/what_is_polar_and_non_polar_in_chemistry.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8a4a2f3371a67c0efecdf/1625859235064/52664047769.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edd635ac614e13d12eef21/1626199605853/what_does_my_daughter_call_my_aunt.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec72cdef188817f7dfbf72/1626108621681/the_magician_and_judgement.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e76c9da3638a455af5da51/1625779357678/define_rebel_without_a_cause.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_off0000c40b.bin
0cf125c8f3da6210cd9f81d852fcb945aafa9c0b49414dd65eb686d9d0aa8605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 15012 bytes
font_01_sfnt_off0000ea22.bin
f143074ef885f06d3c71a8e2351bfcdd35ac371e49d33130de1fe927333ecffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 10872 bytes
font_02_sfnt_off0001033b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 16792 bytes

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