Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade25dd6cb4ee870…

MALICIOUS

PDF

78.9 KB Created: 2021-07-15 12:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e14932cff32d949188ff93baa79ed197 SHA-1: 98251739634f702e768935c58c22242bcd47e817 SHA-256: ade25dd6cb4ee8709b8599308a98045bbc0134fcf640c3f3958364cabd7a72f5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains an embedded URI and a high-severity heuristic firing for a 'free-download phishing' lure. The ML classifier and ClamAV also flagged it as malicious. The primary IOC is the external URL used for redirection, which is likely the initial stage of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://laborke.ru/square?utm_term=egg+drop+project+with+toothpicks PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e960c4db8bb141badb0eac/1625907396934/fiwodizul.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ae3a57d2352c9279d56c/1625796154099/kenepuxij.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed9acc7d02012a3631df96/1626184397064/gods_anointed_one.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9804d2d00a35b8cfdc4d/1626183684222/the_incident_command_system.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efd12a16a6d35a11113dc1/1626329387104/86619488007.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10772 bytes
SHA-256: c09cc7ffb8bd67e241370cfe9afab69ce08697072c35d58e0937966f569ca9a1
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 17036 bytes
SHA-256: b7ccff878ccb704f874040796527182d3efe229490a5c207064dcc3c3c52abe5

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