Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b98c52625ae1b4…

MALICIOUS

PDF

76.2 KB Created: 2021-07-14 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fa910af0a88aa61c94105aa549f0837 SHA-1: b1a473550771cce2efd6aeaf809d810c592828d1 SHA-256: 32b98c52625ae1b4032359bf5bdbc55d313b56156bdacf297cedcd09df1c3bba
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The heuristic firings indicate the file is a PDF with external URI references, and the document body is heavily obfuscated, typical of malicious PDFs. No scripts were extracted, but the overall structure and detection point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/sq/ugae/~3/UQ8tT55rDuk/square?utm_term=the+wonderful+words+questions+and+answers
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede717d6548a387fd3fc83/1626203927210/ncert_class_6_chapter_7_science_solution.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eda732c5e0b1320e35478e/1626187570954/89857238603.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_off0000c7cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 16792 bytes
font_01_sfnt_off0000dfe3.bin
7e9a86f72c628ad9c239dfae43eb5dda80d63bf8e973987a41e12606f9b386cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 10748 bytes
font_02_sfnt_off0000f862.bin
337ca1955908da7ea6dbef69ef3bde04277d5f5d34c13a49df399f26fe26be7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17144 bytes

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