Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af5c86a8e0c548e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 20:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3b723a9bd24713e7480d33d0b7001b6b SHA-1: 80127ba1cd0d2940bafde4e10f1d64dbe07e0626 SHA-256: 8af5c86a8e0c548e4f9a6b65bc5090075846fc1e469725dfac5bd41eda84186f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or distribution mechanism for further malware. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://greenlakepaint.com/ckfinder/userfiles/files/52946805652.pdf In PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/56842468445.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/62012878173.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jozetox.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/55981842075.pdfIn PDF document text
    • https://sentralperdana.com/file/98516345171.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/49013383421.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/dabirabizekaboxajivog.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70232889419.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/10951028518.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/77920856697.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/83314137282.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/luwevomuk.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jeberiwategimavopumekivi.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/78311809617.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/54337867289.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210910222120211002m5bryf3glo8f.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d235cc029a---vedidotulosupe.pdfIn PDF document text
    • http://cpils.com/userfiles/file/bafevabizow.pdfIn PDF document text
    • http://hadt.vn/upload/files/44174606155.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/538f978151f7f577813ded57f767d107/zudenuvi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/57209337090.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73169171582.pdfIn PDF document text
    • http://sinners-party.de/media/file/lavif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=xp+mod+launcher+apkPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 19648 bytes
SHA-256: 4cff6b7b7fa98a80191ac338a45646d7eb22f06a97c2d1bcdb66e07389f38e02
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 10620 bytes
SHA-256: 67b7f98bc040fcfca3125207d3295ceeb4b89c79ff26ee7c4ceb4f8783594a86

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