Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a8cd6d3a403d93…

MALICIOUS

PDF

79.8 KB Created: 2021-07-13 19:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b644b218d86f26b53b895b18317146c7 SHA-1: 8c22c844a998726c6b820c224d5f96008682b198 SHA-256: a9a8cd6d3a403d93c4797e95ffcc0da91904da23570a9340d8e9cd38b7c5ecaa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URL, disguised as a job interview-related link, suggests a phishing or social engineering attack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

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/~3/0YvHz_IItD0/square?utm_term=answering+an+email+for+a+job+interview
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc0b0d9d5ad70ebcf28ea/1626194096601/74898271372.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca3141cff58014d56cf80/1626120980124/zibipopexudajamode.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e835aa1c6ee137fa14684f/1625830827174/sofizujemadawexusipugiwig.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec90587b14134336ddbd06/1626116184684/human_resource_information_system_mcq.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e95c8a27127e68041781d7/1625906314885/bixokoturijutilurewolat.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9022dc14ff043cd5b9966/1625883182096/nakerirububip.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_off0000d37d.bin
014dd1118af9e54d06ab09a2a317c01d5f7ae8a42e13cdb4ebeefa060c84f4fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 10960 bytes
font_01_sfnt_off0000ecfa.bin
f2e3295f1b51c37bd98cc5aacb7b2cd97f8b1f0064ddecbeda1b0bdd10c5b97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 17552 bytes
font_02_sfnt_off00011b20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 16792 bytes

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