Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83435f9054ee0aa…

MALICIOUS

PDF

89.7 KB Created: 2021-07-20 10:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4c3de8d065bf932d3d7921e9a231e55 SHA-1: 216be880c11396d9f2b020084e7bcf54641db36a SHA-256: f83435f9054ee0aae44bc38fab05b9cc322e88e5fab341fa37e55162331f78cd
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to external resources. The PDF structure and heuristic firings point towards an exploit or a phishing lure, likely leading to the download of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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/gPkW7oTCsL0/square?utm_term=top+baby+led+weaning+foods
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3674c51c2e860985148c0/1626564429222/chia_seeds_nutrition_chart.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f62bd949ed543a17d7d8e3/1626745817952/pray_for_the_government_verse.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f3090a04a1d9701797bf5b/1626540298911/the_grudge_game_online.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_off0000fc1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16792 bytes
font_01_sfnt_off00011432.bin
6a7c79bdfd720b803c820487f191e09c36361d91ca539a1407871ff9156d5f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 10776 bytes
font_02_sfnt_off00012cb8.bin
2299eb5e2b22e6aef87356420144986b22f0d4e848b3c76f4337876af8ffb323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 17688 bytes

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