Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42fcff8a43870c0…

MALICIOUS

PDF

62.1 KB Created: 2021-02-11 23:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5deba0565203ba0a45a4a9be0d216003 SHA-1: 63e4ddbfd2619c2d31c9592b8dd36c437f458a41 SHA-256: e42fcff8a43870c046d8606b89077d08d8180ec6a9a07242d277238f674b266e
154 Risk Score

Malware Insights

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

The PDF contains embedded links and heuristics indicate it is a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a game ('frizzle fraz 4 unblocked'). The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=frizzle+fraz+4+unblocked In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ffd1303cf8d2.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/44661742024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcbf6f296098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5fce9618011bc.pdfIn PDF document text
    • http://xafegadixugu.iblogger.org/tukugebot.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/2BVhhjf/21737706671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_5fd8e6b063b1c.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/zesotat/gitisojuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/java_8_certification_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/adobe_premiere_pro_cs6_free_trial.pdfIn PDF document text
    • http://filanovedo.rf.gd/99063859008.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/33863357656.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_off0000b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB975 5136 bytes
SHA-256: 1abe76c9e6b89748e602d8b0b6a36e5e76e6778c706e97f33d1e2d715a3fcf3b
font_01_sfnt_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 9700 bytes
SHA-256: 414dc3cf362ea354b336d2c382c7aac8439572963ce8066030c6910e3556e69f

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