Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7317d38a7a9595…

MALICIOUS

PDF

84.4 KB Created: 2021-07-18 15:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9b58cccec1115b8ba33485b44e2dd52 SHA-1: 5c635a1447796da22fd6781dc231c15e735923f5 SHA-256: 1d7317d38a7a9595e53bc7b5ea0977d85a56c36610bdbb4beeca2f55d0eddc77
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to lure the user to external resources. The file's structure and heuristic firings point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/~3/9xivtwLAy4k/square?utm_term=accounting+interview+questions+and+answers+guide
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f39d831d3507074222688b/1626578307129/vewipakuxodoge.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3688854c26a0cc3fd115a/1626564745001/accounting_4_year_plan.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e817cd80504e0a776c1bc2/1625823181486/ngn_to_php.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2aca92e59700d3e567f5c/1626516649361/61149198870.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_off0000e826.bin
b727ddcf3e57e211fa6facebbe9eedcdfafe5be39261d03c886f8ccef6260fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 17128 bytes
font_01_sfnt_off000114c2.bin
4853009592598cc70588d5d578e468ec5c847db497de5a905096b890526482f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 10880 bytes
font_02_sfnt_off00012daa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 16792 bytes

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