Malicious PDF — malware analysis report

Static analysis result for SHA-256 b137e69c9e327225…

MALICIOUS

PDF

77.7 KB Created: 2021-07-13 05:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0c3ad828d19856a49d882c56924269f SHA-1: af67edb9c9e2f679d372b805791054ab72b341e9 SHA-256: b137e69c9e3272253fa139927e567a13a2a0ada1d01cd2c1fe5bd956d837eb19
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure and the wkhtmltopdf authoring application are consistent with malformed documents used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9214

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/sq/ugae/~3/qI_NY8u86tA/square?utm_term=short+comparative+form
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e85b1648fc737004a60cfc/1625840406543/find_the_equation_of_the_secant_line.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e95ebbf229ba2ea838cedf/1625906875891/8415545030.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecaa58651b7076defe8bb7/1626122840699/27280967037.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8901ce9f0ab08d60ad279/1625853981054/zozusikigekakitawu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca7b0c81c37306b324195/1626122160149/66288711582.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e92ead3b7e7c633450b37c/1625894574051/space_mutual_funds.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecbbfe96412e4a622bb831/1626127358353/stages_of_change_game.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_off0000cef5.bin
4d2406243a24e82570a84613e65a89cd9deca71e457799ec3bb48f60e9c058b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 10568 bytes
font_01_sfnt_off0000e725.bin
8924f767542752e6f3b72a83a819e39dec94e5d7513ab260c349ca92503c1e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 16880 bytes
font_02_sfnt_off000112ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes

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