Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8066fd361a6406e…

MALICIOUS

PDF

71.6 KB Created: 2021-02-14 02:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a4e9ab52d56d3e8b3c6b9e840c057a0 SHA-1: bf17e48410a0b36e5c8446a50ad237ea538f26b1 SHA-256: f8066fd361a6406e8f2c3a80bc737752fea54e26cdbd4bff0a16dcc449613406
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=kingdom+classification+worksheet+pdf'. This indicates the document's primary purpose is to lure the user to a malicious site. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=kingdom+classification+worksheet+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5ff5161d8aa4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6023a0dd67d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6018d01b391ff.pdfIn PDF document text
    • http://lidzadva.xyz/gijufafosixogepxx99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fdeaba681464.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/pexabiwudofazemiwu.pdfIn PDF document text
    • https://nogabujo.weebly.com/uploads/1/3/2/6/132681452/gujozesajope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_600016337cb81.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/jofowonogurabutiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450728/normal_5ffea44eecd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd1006e81f40.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/5003679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_6021622a04f14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_5ff65c80511f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5ff811c8a1174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 5480 bytes
SHA-256: 812cea0903ee10c10bc2ff9e39d109d19e9bedfe17a621387a94b07df570ae91
font_01_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 14548 bytes
SHA-256: 87a110902de729b4bf62ebbfe3097e9adf125e9c8d219490db2e54901f464948
font_02_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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