Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5a65ba85d09df4…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 13:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 714b54cb64a83392f8a09ffdeedcb144 SHA-1: 9fe6f606ed1de741c6b59eec6b04a069a8140d03 SHA-256: 9b5a65ba85d09df4fec33ae31acfd34dc94f7fc5a8675e883150d71231fb9b37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=turtle+shooting+games'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly indicates maliciousness. The file likely serves as a lure to deliver a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wix?keyword=turtle+shooting+games In PDF document text
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/1678b44fc7f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5ff110ef295f0.pdfIn PDF document text
    • http://noxopadorilu.iblogger.org/vumabas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fff404e9db19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_600a8167d3dd1.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/nibumapabenopa.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/cd669b02c2601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454682/normal_5feebc3d229f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wavunot/instruction_writing_worksheets_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/55495643734.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/xonitilodusojubever.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5048 bytes
SHA-256: a1eb535dd58bc263a9508ff3de3c52404a45b523b88dabe3bef02e097724390a
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10796 bytes
SHA-256: 11426e8709e13548a3b707315cca0e4462d55ca02fb69613cae2803bb0ec96d4

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