Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c7145c66345c9…

MALICIOUS

PDF

77.5 KB Created: 2021-07-18 00:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f26d48ae9fa8c6b201c2b17c1bd5540 SHA-1: be7ada9f969cfb8bd503b17569b89bb1cf51e408 SHA-256: a25c7145c66345c9139a5da34c006dddccff57015339cce2cb3a425e7d290be3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs, one of which is a feedproxy URL that resolves to a benign page, but the presence of multiple embedded URLs suggests an attempt to redirect the user. No scripts were extracted from this sample, limiting the analysis of its specific execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/-MXWpcYQ7kA/square?utm_term=perpendicular+point+slope+form+calculator
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8bc45e5d4731e3e95120a/1625865285883/types_of_bill_of_lading_in_export.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee6185ab0cb8743be6e407/1626235269094/null_clash_of_clans_latest_version.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eda9158b6fd728761653f8/1626188053858/53528500782.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f34c27deec5816202f0eb4/1626557479695/66972915194.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee24af2af4c01978fb2d07/1626219695334/no_weapon_thats_formed_against_me_shall_prosper.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93f66f107ff2467e9fffd/1625898854944/physical_signs_of_burnout.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e932c5c4c1a734c5d76b1f/1625895621346/xinesotirekoxixipuzikep.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_off0000cd3c.bin
cbb45b0fbccac87b498d471600b6592d0137aee51040c85fbd4f85087981a3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 10884 bytes
font_01_sfnt_off0000e65c.bin
5815292bc3732a643d9512be74493844db0fcec4558d5029e5476eed28f33ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 16648 bytes
font_02_sfnt_off000111d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes

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