Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71230237c9cad93…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 20:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f38a4bb8ea893e724cb177ef45aa586f SHA-1: ad541cb914018d71c9fd689459fc6acb5cc78368 SHA-256: c71230237c9cad938f1d2778747a4ee2f90dee9995dc36ea2d0b1db4f9a4c63a
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 link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lifecare4all.com/upload/files/20836440688.pdf In PDF document text
    • https://reniuved.it/file/jepuporafegekukuxarunurev.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/wotiravemikub.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/57937192728.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/tusolerufiwabanexiki.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/19229927846.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xujasadenapevepajote.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/32941291282.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210916_225543.pdfIn PDF document text
    • https://anandalaya.in/resources/file/xejuraguraleta.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/jodesilomimatam.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/jijumefidebitizevinilut.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/kadesuvozavawabisosamav.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pijarudorokar.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/gawobixap.pdfIn PDF document text
    • http://sergeybazarov.ru/file/gifebibefikuxuvu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161408f0226bdc---39131831118.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210916230555390825xckzr.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/35783235612.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/23958090868.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/63719700608.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/93079947525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=black+theme+chrome+extensionPDF 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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10740 bytes
SHA-256: d92bd0578c5aab0c23f362af5da0662585830be16a87e151a04e7ec4a6e21450
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 18368 bytes
SHA-256: 71d473857f5bc6e585c691b03651ad89fd9f6251489c9ac9ad5a0a412df0c0d9

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