PDF malware analysis — malicious · f80361449cb3cc72

MALICIOUS

PDF

82.8 KB Created: 2021-07-19 07:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 323c7a35bbdf48dfc8bff19701aade68 SHA-1: 273a43fbb904913f8a13a3349952b4787761da79 SHA-256: f80361449cb3cc72da3beeb07d587072c6b90ced903b7ed5488976487b7691c2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF document that contains embedded URLs, one of which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs within a PDF, combined with high-risk heuristic firings, suggests an attempt to redirect the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9438

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/~3/7R6buoffwiA/square?utm_term=teacher+self+introduction+to+students
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee5c68eed6cd77ab63d846/1626233960355/54561129159.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f12a6069d231202573f035/1626417760696/additive_identity_of_integers_is.pdf
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edb3677c55557fb27f2738/1626190695607/elements_of_cultural_identity.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee728a9b1e4d6a361045ea/1626239626369/tuveb.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee314d4d490f672750fc2f/1626222925689/playback_session_meaning.pdf
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee4d9bb82b304768616693/1626230171527/minawoxibuzagakuwizefuli.pdf
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee600f2a4cda17626047c6/1626234895122/qualcast_eclipse_320_lawnmower_manual.pdf
- https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f15a3115846f0d14ecfccb/1626430001529/brazilian_real_to_aud.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_off0000e3da.bin` `d0d675392c87de400bda47c1c5fe4d9f4d471857e77e08e855e7d86fc653403b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3DA	10636 bytes
`font_01_sfnt_off0000fc24.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC24	16792 bytes
`font_02_sfnt_off00011436.bin` `9348b25578072a11cc4854348f9de0434d3ed486175a8c6f03d984312cd25721`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11436	16544 bytes

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