Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b062c922feb613…

MALICIOUS

PDF

112.1 KB Created: 2021-07-19 20:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eee05480a2cc6e6683716a333b8e5d9b SHA-1: 40b7cc854c8c1ee6e3740c458fcbb2f1c58233aa SHA-256: b9b062c922feb6136d49f1d13a89ef026c63e5810b214b5ca7486717034e052a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to external resources. The PDF structure itself contains unusual elements, including duplicate object bodies, which can be indicative of obfuscation techniques used in malicious documents. No scripts were extracted, but the overall context points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3083

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/um1bUVUAM38/square?utm_term=words+rhyme+with+understand
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f0600cbdad4d3503ce5f/1625878624487/my_in_swahili.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ae7e5c13cc4fede86b01/1625796222696/who_is_responsible_for_advertising.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f055946568f4645196069a/1626363284641/78613132679.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c3f.bin
ab7ac26c03bcfd6d7b5993e9b0a3479bab91e4101fbfa8b2031ceddf95ad9fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 17552 bytes
font_01_sfnt_off000146ed.bin
ab77f312a2b56acc5f9ec14eb2ebea52917c76f13281fbe8554d7e57d42223b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 10760 bytes
font_02_sfnt_off00015f9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9A 16792 bytes
font_03_sfnt_off000177ac.bin
ff11c8e2b7013c588650e306379db8e5e9c23b0e880a52946c0962c46e022142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177AC 25196 bytes

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