PDF malware analysis — malicious · 3c330b6486f6f68b

MALICIOUS

PDF

77.0 KB Created: 2021-07-18 00:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: b6aa71d8c461bbcd27dcfdbe8e647cfa SHA-1: 3300461b7951c6410b476cec02e5568b8dfee623 SHA-256: 3c330b6486f6f68b08ed6dd668b6c66ffacaaca88b3c4a883776da07f1dda8bb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file 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 an attempt to redirect the user or download further malicious content. The PDF structure and heuristic firings point towards an exploit being used for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9680

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/razvivatel/yapz/~3/um1bUVUAM38/square?utm_term=empirical+formula+questions+with+solutions
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f34998d68f3225905920de/1626556824227/stages_of_spelling_development.pdf
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0447e1e1165054c979f08/1626358910385/if_b_is_a_nonsingular_matrix_and_a_is_a_square_matrix.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1f25c382df77e28244a7d/1626468956768/22476237830.pdf
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9290327127e6804163afa/1625893123219/radiologic_science_for_technologists_download.pdf
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60efeaef1c2a3138378d7490/1626335983264/20518172843.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8bf3154872c510b8e2cf5/1625866033146/82925714130.pdf
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7811700aa07a78939eb8/1626109969484/formula_for_a_curved_line.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90ea58fb24157da6f57ca/1625886373600/andys_after_school_care.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c93d.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC93D	16792 bytes
`font_01_sfnt_off0000e154.bin` `f5a7693f3061f27d8e104f4170fc65aedcf8595f275183c4b7813c429559e176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE154	11060 bytes
`font_02_sfnt_off0000faf3.bin` `d6a0a602a1d5fe08d79a2d43dea7fa00fac014e900f4ae3702f0d7c1d1d97811`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAF3	17044 bytes

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