PDF malware analysis — malicious · d360f0e1c5f5324d

MALICIOUS

PDF

97.4 KB Created: 2021-07-13 16:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 36a573e6651d47ca29380c28861bbde7 SHA-1: 6fd74a6f0b683b7b611f1bb3eacef9183432f6e4 SHA-256: d360f0e1c5f5324df5af0658a42eafd4d472eb503d34c2cec06b94901ccb5edc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URL pointing to 'catamma.ru', which is likely used for phishing or to download a secondary payload. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to trick users into visiting the malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9894

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://catamma.ru/square?utm_term=uh+math+placement+test+answers
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8b74668ba31612b6d379/1626114932130/pamusexu.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e875756b13e67beb16bf6c/1625847157748/kokodavobov.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7acbcba333063f175daeb/1625795772385/sasafezediped.pdf
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82ad7afd06e4982ed7a9d/1625828055753/dog_surgery_cost.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e86da8e63b335b383f827b/1625845160072/35635215453.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec713754a52c186ce31ef8/1626108215904/the_lords_day_meaning.pdf
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7f31ad1bf7105ccb71b4/1626111793232/wivetivo.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e932ddcc7c0864592774a7/1625895645451/how_to_drive_a_right_hand_manual_car.pdf
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec93ca243eac6055d02bd9/1626117066711/in_text_citation_apa_more_than_one_author.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_off00011854.bin` `52e748d406843a99931f46d0b14399b6e19fea44832cdb8d0be8342e0c2b9a16`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11854	19288 bytes
`font_01_sfnt_off00014991.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14991	16792 bytes
`font_02_sfnt_off000161a8.bin` `c704d53adc3c825d2e2f891e7014456ccb7c7ee80e7b872e8f292238d480d3d2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161A8	10520 bytes

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