Malicious PDF — malware analysis report

Static analysis result for SHA-256 54706553e18d6821…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 22:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c64414541fb2e260c0279616aaf4bca SHA-1: daec31cb4006903cae1e3a8a9536e35f504468c7 SHA-256: 54706553e18d68219d695e4bc65d74a94468a5eca7e729511b53cfd87f59fee6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including embedded JavaScript and a high number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=android+tv+os+apk PDF link annotation
    • http://speckrepeg.by/UserFiles/files/96081294921.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/36072639065.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/soreseredaterot.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/pemakamu.pdfIn PDF document text
    • http://kag.fr/userfiles/file/71821332460.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54b538988---50743873591.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76308720356.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17233091316.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79e957b09cec679602e5fe6af4ed882f/57417971600.pdfIn PDF document text
    • http://saimiri.name/upload/file/27513023935.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/82962028482.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/38889828258.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/43317752901.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/rirolusotafipiral.pdfIn PDF document text
    • http://bulmarconsult.com/files/jofiwezivoguv.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/29357538350.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kimifupa.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/8099731257.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/59327041643.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/sujoluvurupavisisover.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/61250937903.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/fopilukuge.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8999721145.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/gagalisuzuzivo.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/98378373940.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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 17676 bytes
SHA-256: 3cc80b7e406514395e0d7bd68a486c849106e6ec57a6d4a14b8cf6e79a371995
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 10348 bytes
SHA-256: 8114b5d8b3f62e668f00c4c847566da44341e0c37dc2a13b2b7eeebba562e10d