PDF malware analysis — malicious · 13fd16c7b2ddd14b

MALICIOUS

PDF

78.7 KB Created: 2021-07-16 04:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: c5fe20e7cc67937fbd62b43f1e7560cb SHA-1: deb2f277acae00dc7acbe01cd20a41febace86a4 SHA-256: 13fd16c7b2ddd14be9860fbe1146e8d0bacf406d95eaa59aeb01a1a0b2020037

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to redirect the user to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9478

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/kVSxLQpkboc/square?utm_term=times+table+practice+worksheets
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee03ddc450ee47308316d3/1626211293915/40102820298.pdf
- https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60effc496611482e0a90af0d/1626340426037/javijim.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8721d3ebe920a7834ffbb/1625846301543/97081966522.pdf
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f8e718245d33f1801106/1625880807282/automata_and_complexity.pdf
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eddef510369373fd8405b3/1626201845715/sufizobidewutasirajitij.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ebc10cbdad4d35037dca/1625877442089/74650943091.pdf
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee125502e0767984f03a73/1626214997847/digital_signal_processing_in_power_system_protection_and_control.pdf
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eddf40d6ef6771c1dc13ad/1626201920882/87500571915.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_off0000d33e.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD33E	16792 bytes
`font_01_sfnt_off0000eb55.bin` `26db3dfea00665dbd857bcace85d49d05f0e8cedf5adb0fd606e8ae5b4e2d7a0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB55	10816 bytes
`font_02_sfnt_off0001041e.bin` `c3eb4e29fbecacb032b64550e64fed539af537fdf904891b1e94d214eaa6a464`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1041E	16348 bytes

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