PDF malware analysis — malicious · 55c809008e4ea66e

MALICIOUS

PDF

80.0 KB Created: 2021-07-15 08:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: e4ec80c6e31c9d3689d1197acd0ec016 SHA-1: e23baf4f02f94f954814bc919e6cbc8b094b2b82 SHA-256: 55c809008e4ea66e9759ac4ec0caca6f2aa086fecfc91930198263b4938f25e9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains embedded URLs, one of which is a Google feedproxy URL that, while confirmed benign in this instance, suggests a pattern of linking to external resources. The presence of PDF-specific heuristics and the authoring application (wkhtmltopdf) indicate it's likely a crafted document intended to deceive users, potentially for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.8666

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/sq/ugae/~3/ZFaGRQ6RLlg/square?utm_term=beginners+guide+to+java+programming+pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7f84028bb5f4f51649946/1625815104799/find_equation_of_a_line_that_passes_through_a_point_and_is_perpendicular.pdf
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7df104454ab0ddd861e05/1625808656399/tattoo_font_styles_names.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d67c1651423cab5f3051/1625871996332/66571862571.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e874bc7727436ecd345471/1625846972425/s2_made_in_abyss.pdf
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efcb2de9d3bc6103fb7027/1626327853163/quantum_theory_simplified.pdf
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edfa8ca9aa746350cef698/1626208908188/rexozajaxudine.pdf
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e799bd48fdc259403d1296/1625790910036/which_planet_has_the_coldest_surface_temperature.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_off0000d6d2.bin` `949385a8f474b42f98386e7ce5f71cb24683026891884e38166b914d77f20aad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6D2	16488 bytes
`font_01_sfnt_off000101b8.bin` `5bb3b04ab9a19c32631f8d30e4f1ce08234e777822f618cad4d0ee8f67337fe7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101B8	11144 bytes
`font_02_sfnt_off00011b95.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B95	16792 bytes

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