Malicious PDF — malware analysis report

Static analysis result for SHA-256 58421d4ab56d7699…

MALICIOUS

PDF

81.4 KB Created: 2021-07-13 18:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f2e9760f3e79957c26f73aff7ac2344 SHA-1: 11522470ddb0d10a3503aacf1c90a73b170bb60b SHA-256: 58421d4ab56d7699c754bdfc7eb82c852c20c9e7f2dda61f51274b9a5b57c48d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a phishing attempt. The PDF contains embedded URLs that likely lead to malicious content or further phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/CHqDoFjlE84/square?utm_term=lanthanide+series+definition
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f6af2f3c4128e1885b74/1625880239809/meaning_nature_and_scope_of_public_administration.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca42ebc6eee4b05916844/1626121263031/zuxid.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed42a96b40a9602c94f049/1626161833169/munaxawib.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca847e0914637f38e6b1b/1626122311155/nurapezokuj.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e88e2572375073f5819e13/1625853477691/tivud.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_off0000de27.bin
76a1869bec49fed4cc59803521f60194d6a1d0c74bf958bc0d5f62b1b98e9749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16904 bytes
font_01_sfnt_off00010a60.bin
8c84eb4f50e71ecddbf657affdc4feb2ae2f637821b023d959538b4d7f553a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10364 bytes
font_02_sfnt_off000121b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes

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