Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c35577def6dee62…

MALICIOUS

PDF

75.1 KB Created: 2021-07-14 03:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a156403e98ac63fb6fd529be2b06ba3 SHA-1: d4a96f13b1e31d23ab2952f34e8b574ab88f017b SHA-256: 1c35577def6dee6283895f914ea027b20a77710e2861f898bf38f7aeb6284ecf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI that points to a URL disguised as an excuse letter, suggesting a phishing or malware delivery attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI indicate a malicious intent to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/HbdJGeoIq_s/square?utm_term=example+of+excuse+letter+in+school
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfc8ce83f616bcf861a30/1626209420202/morphology_of_flowering_plants_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee04f6a0f2ca3483d63760/1626211574534/48798775748.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e80b724d2175279d155783/1625820019196/multiplying_complex_numbers_calculator.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_off0000c365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 16792 bytes
font_01_sfnt_off0000db77.bin
546e0a06059a5af42e4f53d732a5460a3f9a2dd495934ddb00ccd82701716d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16920 bytes
font_02_sfnt_off0001077d.bin
f489ff9a4f67433ba31a7cd4bf9ab09551c80daae235942e0328e38c5f920289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10928 bytes

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