Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a7acb58cf0515b…

MALICIOUS

PDF

80.2 KB Created: 2021-02-14 10:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ba19498c773e5b642b114c437828a13 SHA-1: 221559fb53fbfa57815a513da6c69c705d732933 SHA-256: b5a7acb58cf0515b44d0e01d7f5ff83057d5b5b40076cad0ad7b5f24e22cb971
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/wix?keyword=perimeter+of+a+house+worksheet PDF link annotation
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/3791a.pdfIn PDF document text
    • http://garirixis.22web.org/butterfly_wallpaper_cave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fddbaec4e027.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/lexojiranol.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/5884002.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/xomanida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5fcbdd525916b.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/76d01e7e81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5ffb6ea535aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc71e58b8213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fecf08539685.pdfIn PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/1443433.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/zepoxulipudisijoz.pdfIn PDF document text
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/defugewefame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_601d3527aa450.pdfIn PDF document text
    • https://porepegozid.weebly.com/uploads/1/3/6/0/136050151/5725596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fc90ecb63b69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulumibapetemom.epizy.com/74693836920.pdfIn PDF document text
    • http://diwavese.rf.gd/vekewi.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bluestacks_windows_xp_professional.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/chori_chori_movie_mp4_video_songs.pdfIn PDF document text
    • http://lajefuvubesij.epizy.com/79386992257.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_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 5132 bytes
SHA-256: 49f5931d5c5a976752f0ba39b96da9a9c8ab8cfbf4ee885939fe6e82abeaa842
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10940 bytes
SHA-256: 1b14ccaa7ba5588c82e64a6d3c1a05c35df6161db7756e114d26dd71fd86660d

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