Malicious PDF — malware analysis report

Static analysis result for SHA-256 52438a2a9935923b…

MALICIOUS

PDF

79.9 KB Created: 2021-07-12 20:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93b450a91fe7833df9ff912b12ba448d SHA-1: c451f30dc60a23b24446744c812aea14d93e06f9 SHA-256: 52438a2a9935923b793fb1de5738f605ccbf38a7102c448b104104fea803664d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The PDF structure itself shows signs of manipulation with duplicate object bodies, and the embedded URI heuristic further confirms the presence of an external link. While no scripts were explicitly extracted, the presence of a phishing-related URL within a PDF strongly suggests an attempt to redirect the user to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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://medvor.ru/square?utm_term=art+and+craft+shows+in+michigan+2021
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ec89fc46b1505825a211/1625877641554/77100472962.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec82eff89f8e700bf753fc/1626112751744/essential_grammar_in_use_download_free.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_off0000d567.bin
f4ad18a8de97ef9d97baadb20ce88e5eb16c8586b1c963a07505e1cbb69e8786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 11108 bytes
font_01_sfnt_off0000ef13.bin
2a90c3917bd59b2f7562d53a644257e3754a0e6897fa1ef3e7389e063990656a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16808 bytes
font_02_sfnt_off00011a2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes

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