Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cb6861cd4e9b37…

MALICIOUS

PDF

79.8 KB Created: 2021-07-14 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31171b2540973d288baffab71cfb017b SHA-1: 15a310c8ebb4f799bf25bb05e465fcf16008115e SHA-256: f0cb6861cd4e9b370d1de1d072f0875c8dcb8d675a1dafdd5f26396f95a4f035
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, specifically as a phishing trojan. It contains embedded URLs that likely lead to malicious content or phishing sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML/ClamAV detections suggest an intent to redirect the user to a malicious resource, characteristic of phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8584

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/W5vEtEh6t-A/square?utm_term=what+is+time+and+a+half+for+13.50
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0839eed6cd77ab5dcb7c/1626212409361/how_to_write_a_guide_template.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca8a7243eac6055d26810/1626122407896/wuwevu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eda1cf3d37cd087e6cfc8d/1626186191811/detoripemisupunijumul.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0ad227fa864c7d0dcf71/1626213074472/marvel_films_in_order_to_watch.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8e39b3b63f0898f2a62b/1626115641974/43023388321.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8e07f83a7f26ecd15ed0/1626115591217/population_of_nepal_in_2020.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e65812fb7d0b2790536c/1625876056094/lake_near_squaw_valley.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_off0000d692.bin
de8d9867482db9523f1e7422925cd7859e88123648fe712d5586155152263317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16004 bytes
font_01_sfnt_off0000ff60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 16792 bytes
font_02_sfnt_off00011777.bin
34d79cc4e44aaacd8e15427144145d6c1456422dd00df483b6ffe9d8429dc53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 11156 bytes

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