Malicious PDF — malware analysis report

Static analysis result for SHA-256 4549ec4850c766d2…

MALICIOUS

PDF

85.4 KB Created: 2021-07-13 16:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db73831e5bc51afcdcb5545b56b99ce6 SHA-1: f8848a25ba3cf3a4f2734f466f34a145f83321a9 SHA-256: 4549ec4850c766d265140f4d54e44403f65e337cb33163b0820a84d157a89bcc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it is designed to lure users to external resources. The primary IOC is the embedded URI which, despite being labeled as confirmed benign in the provided data, is flagged by heuristics as a potential phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/IdU8rIDf9lQ/square?utm_term=how+to+make+people+want+to+talk+to+you
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca8537d354a5e86a673a8/1626122323854/social_studies_words_that_start_with_y.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed11d964a4563c8f7976a2/1626149337397/7th_tamil_new_book_back_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9374fe370ac63228997c9/1625896783804/55307190477.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed36bde255175820be9890/1626158781878/2020_best_places_to_retire.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7907f5c13cc4fede649d1/1625788543718/29144998492.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_off0000eadc.bin
5cbe90fe839450d5ef3836ba5fb1af315af47174538f53f90fe13c2aac8ccdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 17384 bytes
font_01_sfnt_off0001180e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 16792 bytes
font_02_sfnt_off00013025.bin
18b4326ef2c8c8b1ff3c9bca6816a0753be84e6b0fdd2378ec646957cf91b07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 10436 bytes

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