Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff3d48b29453035…

MALICIOUS

PDF

87.9 KB Created: 2021-07-17 01:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3911214a66c4655c82d1e3d6bf8431 SHA-1: 4dd1450ccfa11c1d79de231baa74332131f5be22 SHA-256: 3ff3d48b294530351bc6eace6d6270b4a9a6b48322bde33591c0c709610a17ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or redirection attempt. The wkhtmltopdf authoring application and the nature of the detected heuristics point towards a PDF-based attack, potentially involving embedded scripts or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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/~3/4aHNpQc2m6I/square?utm_term=cleburne+tx+to+stephenville+tx
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec872aef188817f7e1b9ab/1626113834510/if_my_complaints_could_passions_move.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecf635a17c7f1bf0fe2350/1626142261791/what_can_i_use_instead_of_dry_sherry.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f206cf1693376a833bb5bb/1626474191336/how_to_make_an_absolute_value_inequality_from_a_number_line.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91af73f195e1e4036248f/1625889527321/the_expendables_1999.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed8feef8b4e244e40053e4/1626181614415/34409134893.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e78f1b6d117d6eec9f9a5f/1625788187109/gta_online_best_clubhouse.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1371844f13e0787b32731/1626421016660/what_phase_change_shows_a_change_from_gas_to_solid.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e87d50c089c1459a16a6dd/1625849168680/dojusexo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec823a0cf33f708d7a46da/1626112570821/apa_referencing_7th_edition_website.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_off0000f644.bin
cca8340a9565e84f43dfc5c945ae9c9155c5128cb85b7e744c10c2a1f07b1cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10624 bytes
font_01_sfnt_off00010e59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 16792 bytes
font_02_sfnt_off0001266b.bin
2ea767201e7dda6448e02fc829f92e4f7681ef7cb671eb8566603ffcb3b3a65b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 17096 bytes