Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735799819b85141…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 12:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d121dc9460c3b0a76e4083a414543334 SHA-1: 1dded8359c7d552aaff67f7408940e8ad2a5a6bf SHA-256: 2735799819b85141d137cbe9fd66c135918a75a65f3f595d2d5aa38a67d01e98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also acts as a link farm, directing users to numerous external URLs, one of which is `https://coretry.ru/uplcv?utm_term=download+damon+ps2`, likely to download a secondary payload or redirect to a phishing site. The presence of embedded JavaScript and numerous external links strongly suggests an intent to compromise the user's system or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=download+damon+ps2 PDF link annotation
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/3375323501.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/63870212834.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/37519575557.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/narubewanogepa.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e0f8f28a6226291c71012e2c1cc6308a/mesukuvosuja.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/10775201229.pdfIn PDF document text
    • http://kag.fr/userfiles/file/92116570279.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/votogewekulodagoxipodopu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc5c566cbcf9362be11af67647468e68/viperononim.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/kanizazur.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/20646649188.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/57648749329.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kejunawuv.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80924440539.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/28020201821.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/gukejapavu.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/61360513061.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/japidakenisavibopiremen.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/54511348969.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nuzumolivodusulo.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tutabewujadagib.pdfIn PDF document text
    • http://imoroz.by/upload/file/gazijazojixave.pdfIn PDF document text
    • 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_off0000ad40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD40 16324 bytes
SHA-256: 54e0ecce0700c969ea3d7c9a3ec7a2e79b2fdad0b8fbcb86a5d837d71cff840e
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10336 bytes
SHA-256: a5cce9d8edd8c47b2f41f6fe4e4b47cace3aa5cfe381d903d35ae9a64421b962