Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc05aff564d69cf1…

MALICIOUS

PDF

73.9 KB Created: 2021-07-18 10:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c25586c0c5b3459e73b633dd3990d94 SHA-1: 3ab35bae40698be87d1a997c20ad282574a8b807 SHA-256: bc05aff564d69cf1788cbf8bf0a467ea8c1ee9b56c6ad4734ba15f89b052d911
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as a phishing trojan by ClamAV and an ML classifier. It contains embedded URLs that likely lead to malicious content or further stages of an attack. The presence of these indicators suggests a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/mHcMeCcfVl0/square?utm_term=kindle+fire+pdf+viewer
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e826c84d2175279d168191/1625827016299/all_sport_5000_series_control_console_manual.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3c0c350974615f926fe23/1626587331095/syncope_while_urinating.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f3c25c50974615f9270626/1626587740484/we_will_rock_you_l.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c073eebddd6e48ecf4c4/1625866355856/free_online_conversion_of_to_excel.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f004da177a4e2836d3a043/1626342618634/southern_braised_cabbage.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8c51159653256e7b23d9d/1625867537293/12357260971.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f301abe13ee9766603e5e2/1626538411927/miscarriage_icd_10_code.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f23e7f4b68c137e690dfa8/1626488447239/in_the_strongs_concordance.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_off0000c3a2.bin
165e17f2682dee75e4b67bb9df9f3f7186ddc67dcd77650d7d9f206fafe9e944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A2 16040 bytes
font_01_sfnt_off0000ecff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 16792 bytes
font_02_sfnt_off00010516.bin
ce0061685cdef3db4de061f4ec563a44a021e7c85acdb6c82552bddd274b1e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10084 bytes

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