Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c999b1022edaba…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 13:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6279a593f9217d3e94402265ca509e1c SHA-1: c7dee0c064355370f896e0a84070eb947a7d5418 SHA-256: 86c999b1022edaba31a3d4e4bc7679b86993162a08b565073ededb3de641e15d
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to press Win+R or paste a command, a common social engineering tactic to bypass macro restrictions and execute arbitrary commands. Several external URLs are present, suggesting the document may download additional payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=take+safe+mode+off+android PDF link annotation
    • http://mbfeed.vn/upload/files/favematemopizozizi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/66270375303.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/gafam.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/35137747303.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/kebatajuporokigokidereka.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918072438788.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17626459737.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/bogomamadanufut.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be9893079---zurazupejowoxurudegufub.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/93618562447.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16143e553da91d---73652197178.pdfPDF link annotation
    • http://progetec.org/userfiles/files/88970708323.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/86704783575.pdfIn PDF document text
    • http://unityproductions.com/upload/files/21631194803.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16549301546.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/82880438540.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/5752083004.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/bilagom.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gegukovozusagiwuxerewotez.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/49426993468.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/32175157115.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/loabmku0bbi2oq1tui135mv3a2/56591914082.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_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10428 bytes
SHA-256: 3db3c287f1a1d7307efe335a4b3362eea18bd01f1a24d213c6f7841489cb1c39
font_02_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 17424 bytes
SHA-256: 70c23a6af8314b1d29fd10b3a31ecbe6f364c3b53c91bd9355a33f52914488f9