Malicious PDF — malware analysis report

Static analysis result for SHA-256 4533e990a134a2d0…

MALICIOUS

PDF

81.5 KB Created: 2021-07-13 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7941e8d88e545b12684e46a61e4eed82 SHA-1: 3cd3273e408b18cc61d7a5e64993be69b0d6b8e4 SHA-256: 4533e990a134a2d0fdefa31093791685dedddde1482dffd225ab534424c33415
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. Although the document body is heavily obfuscated and unreadable, the presence of these indicators suggests a phishing attempt. No scripts were extracted, limiting the ability to determine the exact payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/jEScUJLm1bs/square?utm_term=1918+knuckle+duster
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca78897282d6f4693a552/1626122120354/7033762517.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92739320dbd0de281447f/1625892665101/use_edification_in_a_sentence.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecf2dd1c817c33f6d0a2c9/1626141405966/letter_to_a_lost_best_friend.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e842fd1adc714db6e2debf/1625834237630/acquiescence_legal_definition.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_off0000db76.bin
ef57b226deb918e3d4cd17c35dea2bd07e5851661829b64fbad2c42893771920		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 10512 bytes
font_01_sfnt_off0000f39f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes
font_02_sfnt_off00010bb1.bin
822ffa198368ca277f23ee7aeceb6a303132657d9c1f500d2feed0e8ed3ee0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 17300 bytes

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