Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dcf62c134fd478…

MALICIOUS

PDF

79.1 KB Created: 2021-07-14 10:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: addbef7dfbd1600b617f83cfb12fc2b1 SHA-1: 14213161355aa1ce0a8f8c4622cb9c464f9b2979 SHA-256: f7dcf62c134fd47870b8016d16532c6838aa9a5dd6c966fff81fccd3af976f95
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a PDF phishing trojan. While the embedded URLs themselves are marked as benign, the PDF structure contains an external URI that points to a Google feedproxy URL, which in turn redirects to a page with interview questions. This suggests a social engineering lure, potentially to trick users into visiting a site that may host further malicious content or phishing forms. No scripts were extracted, limiting the analysis of dynamic behavior.

Machine Learning

  • Nyx PDF Classifier clean score 0.1454

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=interview+questions+and+answers+in+net+for+experienced
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7dd6cafd06e4982ea894e/1625808236674/sabal.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94b0892abcc18c4f76309/1625901832558/great_companies_to_work_for.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_off0000d600.bin
3c51470a6ab0dc30d6fd9367b9566790a79c465574375e76dca6037da608c972		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 11020 bytes
font_01_sfnt_off0000efa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
font_02_sfnt_off000107b7.bin
aa69f0d0c91dab75ebb9b40201154fcf2cde8051b97465ac73abbe2c1560843e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 15884 bytes

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