Malicious PDF — malware analysis report

Static analysis result for SHA-256 84aa372bae6b79c5…

MALICIOUS

PDF

76.4 KB Created: 2021-07-17 01:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32a3d197cc53c1709f11e6b5a9e30496 SHA-1: d46d21f2f8d27d0e477682219eb55088e209166e SHA-256: 84aa372bae6b79c5492e382423b3804ed3b3dbc76b5d581e4593d918c104b4af
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a heuristic for a 'download button' lure, combined with embedded URLs, suggests the document is designed to trick users into downloading a payload. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/EjZ5HCEZs_A/square?utm_term=perspective+of+modern+physics+by+arthur+beiser+pdf+download
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e914b0025aa46e30d245a6/1625887920837/52691046263.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7f1307e45264421f98ecb/1625813296369/61338191773.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f20a5a52a315316be2b239/1626475098294/53067504662.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee46d30a53c127f5d94214/1626228436046/18111316346.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f063e17fa2070f31987f8d/1626366945235/the_best_snowman_ever.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7ff4d4261ba7980625f4b/1625816909251/sweet_home_chicago_intro_tab.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e77c8b7920a346d3d1783b/1625783435882/section_44_employment_rights_act.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e924a8c4c1a734c5d6e4d8/1625892008413/signs_of_severe_hypertension.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec87e90d838b6c850d63d7/1626114025279/35753391769.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f201c554ceab78eed1a444/1626472901301/kimasumibugera.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e869192a19bc2028759850/1625843993770/function_of_hypothalamus_in_physiology.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca0807b14134336df606c/1626120321099/jonixopezirazuzododape.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edd45077fc8e778b562ddd/1626199120532/dilwale_tamil_dubbed_movie_download_in_hd.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_off0000c6d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 16792 bytes
font_01_sfnt_off0000deeb.bin
e23110d6bfbe941a6a8f1801fde8c8c13b4f53f5787baff184b241da54ae08c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16104 bytes
font_02_sfnt_off00010813.bin
3312ace30b1f79be3b728fb74c8f4dbad31ce81c0d4f662db4da22e0a6055555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11392 bytes

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