Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e84024db17efae4…

MALICIOUS

PDF

73.6 KB Created: 2021-07-14 07:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996886c20219e201b206f815a7911ab8 SHA-1: b02fde2eddff866980d4dcfcada5dc095a77caf9 SHA-256: 3e84024db17efae472bef510c3a1b70a2d7d66390f281e795bb08783f32e93fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL that, while currently classified as benign, is indicative of a phishing or malware distribution attempt. The ML classifier also strongly suggests maliciousness. No scripts were extracted, but the PDF structure and heuristics point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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/CHqDoFjlE84/square?utm_term=basic+meaning+in+english
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e879089848097a3e18e1eb/1625848072125/fozobuvexenok.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7c5eda3609a707bab1410/1625802221776/wasp_like_insect.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee072f670c344ea76134ef/1626212143983/henry_the_stickman_infiltrating_the_airship.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee48e0db6052518ec75052/1626228961014/26_to_the_nearest_10.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede61de635d7166462759f/1626203678091/denatokeserexoza.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b7175eabb22f35d8da07/1625798423314/example_of_rebus_puzzle_with_answers.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_off0000c333.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC333 16792 bytes
font_01_sfnt_off0000db4a.bin
9b1abee9051bf927ad585b9fb2f3fab41377deb758effd5da7ef440252b3b763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10412 bytes
font_02_sfnt_off0000f2a0.bin
257782a0fe3a0cf618ff9a13efd67ad25be4c9d2fe85fdc5da7ceaf18ff10b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 15648 bytes

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