Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e80f565128b8e41…

MALICIOUS

PDF

81.9 KB Created: 2021-07-14 02:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ce35c2ed8f5e88be44db303d62f7fd8 SHA-1: d8492ae1e76cc55eeded999f3ed63f45590bb5ef SHA-256: 3e80f565128b8e41b1e558239358a89886eed87ae760c5e94c2b137f475e94a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The file's structure and heuristic firings point towards an exploit being used for client execution, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://feedproxy.google.com/~r/sq/ugae/~3/UZrB20b2Dcg/square?utm_term=applying+decals+to+models
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7aa35d0799e4214bdcf54/1625795126041/what_is_your_goal_in_life_best_answer.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edf3f8e6792c2552bd24a4/1626207224201/83689596041.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9bf2573bc4731c895075/1626184690396/7659376781.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0888c27d1e40a546127c/1626212488685/90289797657.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eded6282b49873592b8531/1626205538774/layers_of_digestive_tract_wall.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e266b9b95949b65b5dc5/1625875046656/victure_wifi_extender_manual.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c041e534972f7b7994b1/1625866305650/best_quest_based_modpacks_minecraft.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ea52cc7c0864592434a2/1625877074735/sadoterosowepe.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e95b70b6736875596961a9/1625906032425/gikekopinoxotuvolarero.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9f7845711547b6a8facf/1626120056207/chickenpox_vaccine_during_pregnancy.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7a9be5c13cc4fede80d09/1625795006811/harry_buys_draco_fanfiction.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd71fb0089c62dc3d7c21/1626199839858/xediditoxu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec964ebc6eee4b058fd9db/1626117710325/astonishing_meaning_in_english.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.

FilenameKindSourceSize
font_00_sfnt_off0000de5a.bin
f4d894066ba6ce0debc9e69b63a515059196c46d6507aa11d9d1df2cd6fdea47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 16968 bytes
font_01_sfnt_off00010a8b.bin
b19d3c682a578d8e960d5d0e8cb8ffaddca77f5ee94fce42fc6149dcde328b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10852 bytes
font_02_sfnt_off0001236d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes

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