Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf25e929b59a2567…

MALICIOUS

PDF

72.8 KB Created: 2021-02-11 17:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34374d120cce9b507c927f5a72ce2490 SHA-1: 64793f9bcf1c7a1de2fbfb8b6cd7860e560456ff SHA-256: cf25e929b59a2567ab71841953d7ae27da604000e156992ab3db9ca890aca424
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, disguised as a wallpaper download. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to lead the user to a malicious site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=hulk+wallpaper+note+10+plus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480591/normal_602424e23861b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_60220be62ed70.pdfIn PDF document text
    • http://veletekuti.66ghz.com/market_researcher_job_description_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418786/normal_5fe46f0d96be7.pdfIn PDF document text
    • http://teaapple.space/interrogative_pronoun_worksheets_for3i4ld.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5feb540a335c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_600a9dd18e9bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5fff2b391ceb5.pdfIn PDF document text
    • http://galoomer.online/jotasanumipotesejewfm8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff71817461d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5fc8b291d46d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422180/normal_6002ab2014d2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383681/normal_5ffd5ba3309a9.pdfIn PDF document text
    • http://rafale.store/demet_akaln_koltuk_mp3_indirm2ijy.pdfIn PDF document text
    • http://gomededow.22web.org/isa_805_audit_report.pdfIn PDF document text
    • http://my-favshopd.online/gunslinger_matt_mercer02yuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fef6999c9b50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tilukonera.rf.gd/bubigibamilodomasizede.pdfIn PDF document text
    • http://jikolelekad.epizy.com/rosary_guide_thursday.pdfIn PDF document text
    • http://kubusefot.epizy.com/sakigedebiwugo.pdfIn PDF document text
    • http://xekujigifur.epizy.com/kabegoromisinojojezitol.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 5124 bytes
SHA-256: c2d68a80c6042723f99c2579d1eb9612e8703f0230a702b0e4a34c86151ecf94
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10676 bytes
SHA-256: d76b0352fdb520fcfe2328a03a6a02b445ddd222ca95c20672126e2b24abef59

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