Malicious PDF — malware analysis report

Static analysis result for SHA-256 5532e33369eca4b2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-31 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 984f2c02f28058a631749a53a5ba1454 SHA-1: 9314d7f6d623302a700ff85259eb8e00bb29c62f SHA-256: 5532e33369eca4b2c8dff88eda75dde5f5b0f5fa96edc583132ddc3736390d28
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=isoniazid+davis+drug+guide+pdf
    • https://vexifodukegaze.weebly.com/uploads/1/3/5/9/135977609/2904202.pdf
    • http://instasurprise.online/13802673907l9ugc.pdf
    • http://bizifemodefi.mygamesonline.org/jiwujelabawanizudegoname.pdf
    • http://i12tws.website/kejalepimarejufati2xqyl.pdf
    • https://lugexobamav.weebly.com/uploads/1/3/5/9/135965248/2657396.pdf
    • https://static.s123-cdn-static.com/uploads/4485943/normal_5ff50d0f4daab.pdf
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/letubufed.pdf
    • https://dazafilitekanib.weebly.com/uploads/1/3/5/9/135977429/522211.pdf
    • https://cdn-cms.f-static.net/uploads/4403140/normal_60371041a8be6.pdf
    • http://noxogejukebe.mypressonline.com/87573373659.pdf
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/vobaje_rijugizevivale_vunitud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_716d1853c2f84d15b80430e002b03287.pdf?index=true
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_003a3d9824f3436791f9c49d3a7113bf.pdf?index=true
    • http://rewuwuja.onlinewebshop.net/belajar_excel_2020_pemula.pdf
    • http://surafupomef.epizy.com/secretory_tissue_in_plants.pdf
    • http://xatidewivi.epizy.com/27773252189.pdf
    • http://vesedakowata.onlinewebshop.net/will_humans_live_forever_someday.pdf
    • http://runuwug.myartsonline.com/fabaxodogadakifujorizi.pdf
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_b477a4c994174efe811bc933346fe9f4.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2dd.bin
ea7dc0d983d87005c16270f2596c99b7c3188817016c170debd0a423011202e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5224 bytes
font_01_sfnt_off0000f4c6.bin
06982d23af51da810cb9b15ffb2efe4a80b9a298db8f52f33b020601e50fad27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 11136 bytes

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