Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4cc2c2a65035bc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 23:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 748d112ebac3205506725a17a962be36 SHA-1: 5da297616564cc98b59ea06cc482991894d05565 SHA-256: 6a4cc2c2a65035bc400860ea26223f4533f386353ff28ede9cb70fd5174e2516
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the PDF's purpose is to host a collection of links to other potentially malicious documents. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wspaperbag.com/userfiles/file/xupimawoxiwiwimuraxomikat.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/66554277594.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/2109031655127446488lgt2a48igvp.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/884070175.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/51325537083.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/sagokitulub.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/42167041484.pdfIn PDF document text
    • https://aneri12.cz/res/file/50504053838.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902015557.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/87281324479.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e294e3527---55148946443.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bapazu.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/8857693386.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lomofebupoludazo.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/foxofimekute.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/11828371777.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161339134ee3c3---19207463719.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/logererokirubiguzikunipab.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/pixisari.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/58478324683.pdfIn PDF document text
    • https://network-italia.com/file/rolizopivo.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/64392321625.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/87086907657.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pimikatidane.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/59651494621.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/37259170339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=emoji+contact+makerPDF 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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16940 bytes
SHA-256: 97af681c55f31677a4645a1c5ef86e20fe6bd79b5dd73bc80b3c210ee228e1a0
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10384 bytes
SHA-256: c20414a5c0fb47749f97ea5a4329e887f2e8b8ee61e74a6d5d342ae286a65528