PDF malware analysis — malicious · df381107925babc9

MALICIOUS

PDF

100.3 KB Created: 2021-07-13 03:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 757ed51a73cbaad6f8d0996538e0731d SHA-1: 977b763973ba2b6151ca1c69b21dffd5dfd3e661 SHA-256: df381107925babc94d39337170c2df10d53fd7a69c969b9423dda6c6d10432ea

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'inwebjor.ru', which is likely a phishing or malware distribution site. The PDF structure and embedded content suggest it's designed to trick users into clicking the link, potentially for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9385

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://inwebjor.ru/square?utm_term=newton%27s+laws+practice+problems+answer+key
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e503a853d606aebe179/1626111568498/89645432231.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd5ed526e29087384ebfb/1626133997722/90595311680.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c07b596d362fd0fbaa23/1625866363445/baxelejopapil.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec879ead1bf7105ccc352d/1626113951177/baden_powell_quotes_happiness.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e83e08df8f8d090f34dd3c/1625832968123/octal_to_decimal_calculator_with_steps.pdf
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e95a90f107ff2467eab026/1625905808164/difference_between_assume_and_presume.pdf
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94f5c3b7e7c633451a511/1625902940175/liviralelav.pdf
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e949708915684aa53e758e/1625901424850/i_have_a_sweet_taste_in_the_back_of_my_mouth.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_off00012148.bin` `130ed2ff001f9418c87a7e27c8959597b64a957bc49de0b0222039d284d29c86`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12148	10980 bytes
`font_01_sfnt_off00013aaf.bin` `635bd8b93cecaf776ace03dd45c85155ee580d01b4b6dcef92c47adbfb3f8102`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AAF	18140 bytes
`font_02_sfnt_off00016b17.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16B17	16792 bytes

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