Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1eefcf4539dc60…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf59df6feec5b645dbcbf08d2edae958 SHA-1: 834b2f37797f992a6f921ff62f99930a4a2bd2bc SHA-256: 7a1eefcf4539dc6085a979b0af9d670b10b277e898117b6dff3c7e9e0b7d1400
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains hosting PDF files, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://12waktu.com/contents/files/jefive.pdf In PDF document text
    • http://cariboohose.com/userfiles/file/49055933782.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/12497313515.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/47751032123.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18999419579.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/tokim.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/705273341.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kajunujemivazubizamusibud.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/giloxexajuzutalonokuv.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/79758797164.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/napezedifepajavabul.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/85013222752.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/memaloriwavusesofikixeg.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/71014224552.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/17249753169.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4360849832.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fedokupuzuwaluvuwajefefo.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/86652080800.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/kobirazezowozi.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/93509850902.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/toxebatajovujabixewomog.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/vubebogijasirip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+gps+lockerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 10680 bytes
SHA-256: 9b6fdcbb4f880c6c2712ff730535a18beed34e9f6ee948005548be54fb84ae85
font_01_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16716 bytes
SHA-256: c1630aa134dbccac7e83ae2d524203027684c9154cf1c310f62702670cd64e50
font_02_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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