Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec24b6beef5ee633…

MALICIOUS

PDF

73.2 KB Created: 2021-03-19 13:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c663b091eeed1a796d5caab63a62b6 SHA-1: 7b661d7c6816e67f80a807fd49a94b9cb6fd986c SHA-256: ec24b6beef5ee6338b754ec2b8982c09c0a910423f7b568d74141aa60a7db42a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to a link farm designed to host other PDFs. One prominent URL, https://botokaw.ru/award?keyword=similes+and+metaphors+quiz+pdf, suggests a lure related to a quiz. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/award?keyword=similes+and+metaphors+quiz+pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_602fc9291592b.pdf
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff8fd81a67e9.pdf
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fd7d4119fb1c.pdf
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/8568616.pdf
    • http://rezisekuvaz.mypressonline.com/mimupurudogenapot.pdf
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/4623341.pdf
    • https://cdn-cms.f-static.net/uploads/4466172/normal_6015427d73598.pdf
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5ff4f92f0420e.pdf
    • http://jolovomolosubi.getenjoyment.net/livros_de_apicultura.pdf
    • https://cdn-cms.f-static.net/uploads/4489414/normal_601d373b9b2af.pdf
    • http://siwosupegejolop.medianewsonline.com/56747419517.pdf
    • https://cdn-cms.f-static.net/uploads/4410443/normal_6039283c8281d.pdf
    • http://morasuxod.getenjoyment.net/historia_sobre_la_declaracin_universal_de_los_derechos_humanos.pdf
    • http://lenusabipowezo.getenjoyment.net/zozapefepaxeremo.pdf
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fcfed36e497b.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_60241079f2807.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sajatofubote/jozodowobuxin.pdf
    • https://s3.amazonaws.com/fapaga/15386957188.pdf
    • https://s3.amazonaws.com/wulotugadag/sefisadaxejipeven.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/my_wedding_anniversary_status_video.pdf
    • https://s3.amazonaws.com/nelizenejakarug/xojamokajoxewu.pdf
    • https://s3.amazonaws.com/tedowafomaru/legerorilevoxufejififarur.pdf
    • https://s3.amazonaws.com/gixawetopoli/ielts_speaking_answers_on_art.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fb.bin
2626d0fdb57a7b422c76bd324d7240ad5cd6a7c9b2f230997d8e6c715fc846a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 5444 bytes
font_01_sfnt_off0000e645.bin
d29fb370cce35592239cb068641c6a42652fca5577e9994fc79094666554600f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 10364 bytes
font_02_sfnt_off00010978.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 4324 bytes

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