Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b088bd26960d174…

MALICIOUS

PDF

80.0 KB Created: 2021-07-13 23:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d0a69cdaa4fd569bbd54c156a9a2437 SHA-1: 73fe87efd4978d605d7cd2dabba7f672d8761267 SHA-256: 3b088bd26960d1743455c6a3bb2bb5ee2f95d2947120f9980484010037b52d70
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded script that references a URL, indicating an attempt to download a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script's URL is the primary indicator of the attack's next stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/S-4CHg4Qmwo/square?utm_term=the+red+turtle+full+movie+online+free
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec844ed0153e73bf8be44f/1626113102451/most_expensive_celebrity_on_cameo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92409e51f1f218d6a23e9/1625891849259/extrovert_and_introvert_both.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8c86b8016c0d1ad7f87b/1626180742792/pijidorotixopetekuresozeg.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8503e65773473f267a4fb/1625837630392/how_to_compile_c_in_powershell.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7a0e12c1416d2f19cd96/1626110478187/oil_on_water_summary_chapter_1.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda932c7772f26c8521b40/1626188082723/twisted_veins_in_testicle.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec71344c0b954f9ea25f8f/1626108212817/luvogepekobo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7c4c7a1add4dee1ed904/1626111052525/hunger_and_undernourishment.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec78b4fe047727940a7267/1626110132750/what_are_some_examples_of_sex_linked_traits.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8512b21192c658745b375/1625837867479/depetafizezid.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede00236d517042360a060/1626202114150/ring_of_gyges_thought_experiment.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/
    • https://static1.squarespace.com/static/60bf6c
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000913a.bin
c7f7b5f2c027bc697b613ea2a63ed1c8bd824b4f12761fd891f6982d017a8b30		 pdf-embedded-script PDF decompressed stream script payload at offset 0x913A 139 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
font_00_sfnt_off0000d98f.bin
244caeda98daf3987906181f6f9e531ae9f5c9296df4bff4b9bb5e776c6a3d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16476 bytes
font_01_sfnt_off00010403.bin
49e57db238a2e6ed8d91e20fb42e9a3b99b4e37bffc2154734dddeeffdcaa73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10420 bytes
font_02_sfnt_off00011b69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes

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