Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ff19fee812fe7c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 09:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9fa26556e7d825d4bab5d9a5fd6393d SHA-1: dd71779ef0a340a1ae5fc386284ddcb43ea29c84 SHA-256: 86ff19fee812fe7cf986a21625ef00a22069eaae06fec661368506520adbc0ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used to host further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dukra.sk/editor_uploads/files/52464565147.pdf In PDF document text
    • http://onestep-tokyo.com/userfiles/file/46340393543.pdfIn PDF document text
    • https://seerupit.dk/assens/file/94339012319.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/sidozonusopag.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/fuvawel.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jedoxawukixu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/44163952219.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sotiwozebazarosotajepuza.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/tajikudajata.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d25d289a---xogawogesubal.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/8799818523.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20656567407.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10108835273.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309e4300c75---22725164268.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zuzamel.pdfIn PDF document text
    • http://generaldistco.com/images/file/likedozigul.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/94071702081.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/95400405858.pdfIn PDF document text
    • http://placc.info/up_image/50235532596.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/parenajosukopurewer.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vavatexebojugi.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/68521561109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+tablet+downloadPDF 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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 10520 bytes
SHA-256: 3b5084d55458b003d477a64275d5dc57dc8a69b3eed9be758b0074f7c99b1d73
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16568 bytes
SHA-256: 63b99a292887b0d1125480c86ab1a5d475cb1835f96c7e90ed6a95c784b45448
font_02_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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