Malicious PDF — malware analysis report

Static analysis result for SHA-256 848a3efa811d9364…

MALICIOUS

PDF

73.5 KB Created: 2021-09-29 03:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b128b3a0c405a83789a994d1b6a8aa6 SHA-1: 65114014c0915300ecfe7f0ad47562fb6da1d57d SHA-256: 848a3efa811d93643f2665b875ca587101c23ae020b1bc8a6d98830f3b76b0a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also includes numerous external links, some of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious sites for phishing or further malware delivery. The presence of embedded JS and external links points to an attack pattern involving user interaction to trigger malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://frisch.ro/files/file/83473720608.pdf In PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/gisifofow.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/54638728320.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wotumitobur.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/6106483630.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685052249d---kilunuxubaxupuresuregaki.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/rijukegigubizirubilet.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/67704379851.pdfIn PDF document text
    • http://podarox.ru/public/files/vumabasujuturow.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/68812875431.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/wikatanet.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/74711234681.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/69171591372.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/77460145431.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6fb89a09530ac82cc688e937e7bd45e2/zigulumamegepa.pdfIn PDF document text
    • https://jobtiara.com/files/files/sawugas.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/79718721487.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/34105953473.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/wesugonotoradif.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vakijod.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/49790585803.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/88059010707.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/darapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=crash+team+racing+ps1+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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 17964 bytes
SHA-256: 6bc86503d819f37eab2c63d94157cd2b9724b75a718976967313696580761d2c
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 11132 bytes
SHA-256: d40352d38aaa737bbc04fd4cbe7bea7be1845cbef1244a14ca909b99a0eba8a4
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1