Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5190973d4763616…

MALICIOUS

PDF

86.6 KB Created: 2021-10-15 20:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b8164712a2cad3627cacc2109398878 SHA-1: acea6349a48de45c2dd2142604eba0190d934203 SHA-256: f5190973d4763616ca6a8156130eccda8b4371ee7391a14c63799253bff64814
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm designed to obscure the true destination, likely a phishing page or a malware download server. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xn--j1aai7d.xn--p1ai/userfiles/file/26234021880.pdf In PDF document text
    • https://allegypttours.net/userfiles/files/77125736183.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/losirajewalenor.pdfIn PDF document text
    • http://venkateshservices.com/uploads/wenodarebunurir.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/juxaneviponugubakus.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/zigeragu.pdfIn PDF document text
    • https://salwangurugram.com/files/53718844102.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/9453332243.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/49189856466.pdfIn PDF document text
    • https://network-italia.com/file/79440985450.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/24632467953.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/vipokamebifonomifizegi.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/16491785810.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/wudedamo.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/58881875177.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/36749472685.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/soteregejenubele.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/73813991184.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/galorilujaxufikixasi.pdfIn PDF document text
    • https://cubic.is/userfiles/file/59272851407.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/fabetixarereguxudelekuz.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/96919991431.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/49816782458.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wibupagodewuwinunozejefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=a+blank+paper+to+write+onPDF 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10376 bytes
SHA-256: 5a2a9fb69e020074d5a6d3cc868874f4c6a90e6fcff27c38a12cc6873b6e1913
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 18084 bytes
SHA-256: f10c88dae42571d853b6b2de899a820e0f100f937846d86a5f61f13140c8ba81

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