Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac9d2f83936134e…

MALICIOUS

PDF

100.0 KB Created: 2021-07-13 00:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5328057ba303ba656438c5c180f7c84e SHA-1: bdec08fc1cce2d4fcd95a698458a72268418244c SHA-256: aac9d2f83936134e23fb3f5ad26a564cbd4feb70a2b8263b5aa7ad452844fbf6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

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://krisoc.ru/square?utm_term=nerve+chilling+meaning
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecb322ea0e4f2fd488ff61/1626125090422/what_do_all_living_things_need_to_survive.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94f38c4c1a734c5d848af/1625902904298/saqs_for_the_final_frca.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e870c5228db43b00a1a007/1625845957453/83534495893.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8fd51996685841a9a015/1626116053268/pejabedigina.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb37bed332b23a5bc8ca2/1626125180193/wallace_falls_hike_time.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_off000123fc.bin
e0719986a32b77a09cacd184b2473c05afbd9c08ab8760e092e0774c14465810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 18144 bytes
font_01_sfnt_off0001538c.bin
1a2117204692665b9d2786815c81e9a8fbf01e8a29a5c9840aa4466a0fafde87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1538C 10336 bytes
font_02_sfnt_off00016a9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9D 16792 bytes

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