Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23b5c285f0f2ea0…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 11:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 014041e18f8b6aa990dab8d7fcccdec1 SHA-1: af57f55c7f46ac3c8e0e7f74469b0703a7a246eb SHA-256: d23b5c285f0f2ea032849c43ab059ff1a2d83217499afe2b2355372d0c8a61cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are suspicious and point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search queries, suggesting a phishing or redirection attack. The presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://kuzutuzo.ru/123?utm_term=how+do+i+compress+an+audio+file PDF link annotation
    • http://shop-onlinediscount.xyz/vuketakelosogesugurjy59t.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/ighbjaU/mijebidajudesekawujexib.pdfIn PDF document text
    • http://katipef.medianewsonline.com/kixogamemev.pdfIn PDF document text
    • http://about-igsupport.com/8121054882cazbl.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/5271273.pdfIn PDF document text
    • http://qupieasy.online/13742639413fh59h.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/rifjamJ/47305681295.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/ZhbQmHS/53504335140.pdfIn PDF document text
    • http://vandify.com/all_american_slurp_plot_diagramuwey6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 5356 bytes
SHA-256: 43b0373a104cd5489269e0e08ddda4e10e366264916ee031fd222645ecac50e3
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10472 bytes
SHA-256: 4ddb3ce31739648be17550b8b33d197e01851b0c9d841dc77e819898321bb0fb

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