Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed8c67d1e98941e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 23:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2295b3473e925fe4e48019bc3a26d5da SHA-1: afd3bbe8875a4c09940f865d4f20477479cb8983 SHA-256: 3ed8c67d1e98941e0f012c44affa3edca123f75b4ecfc0aab478ee0c8ca0b94f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://wastran.ru/uplcv?utm_term=clownfish+voice+changer+app PDF link annotation
    • https://puntodeplacer.com/userfiles/file/61405734641.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/25829425508.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/12523573002.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73931371632.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/62729883844.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/furatirapaxuvunulunujolir.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210918095427597.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/63209673939.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rizulonuzofomafow.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/pusidavabubesunuxa.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/sijetulaminefukitaz.pdfIn PDF document text
    • http://labotinnghia.com/img/files/radojaduseluti.pdfIn PDF document text
    • http://punaide.com/userfiles/files/zuwaxifulasaz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sapenom.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/28894792700.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/towadedirufisewovenulo.pdfIn PDF document text
    • http://reylab.com/userfiles/file/52470945238.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/49939629259.pdfIn PDF document text
    • https://mahae.hu/files/files/vopox.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/30905019685.pdfIn PDF document text
    • http://domuran.pl/files/file/91724936038.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141f4a4c2589---jefowedonozanepezufijiru.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/26044817707.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/niwinetoloxatefaravema.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/pudatovuvesisefadikat.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10844 bytes
SHA-256: 9ec3d2ff68b509d7686a54f03563c70c4cb6d22e21a98ccf264033b711544154
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 17732 bytes
SHA-256: 78d73d6cf9ddc43a38be7509849d4438da7a6289d2d3a170d5b8be80586c1658