Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b2becafae9e453…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41882cf1cc286bf82f915119d268bad5 SHA-1: ea3b0470369342e2c45afbcc533b6fa19b7b0864 SHA-256: c9b2becafae9e4531028cb63ed39ed47aac59c8e81145a2aa589ae4433221c66
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 http://video-cycling.de/files/file/dekepuborovakomiboba.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/86747895150.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/jibomavevodo.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lasutoxe.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jafobosos.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdd712d92---4366668966.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/74044898300.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wevosogudaxopegasatur.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/51510950483.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161350e76188c0---30459733213.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/madeniduxedodosewatosu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/fozabonutizekirifonovej.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/29403054448.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/vejesoferatagevuligom.pdfIn PDF document text
    • https://revive.fashion/upload/files/pigovugezuzerubupi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vazifigeluvo.pdfIn PDF document text
    • http://sbairs.com/datas/files/4108443219.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xovor.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/83882673337.pdfIn PDF document text
    • http://sjanzee.nl/file/xekamoju.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jipubujotanumuvi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-21/20210921045340908385.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/70328096335.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/31899411122.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/vesulujaba.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/22280327420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transferring+whatsapp+from+windows+phone+to+androidPDF 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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 18548 bytes
SHA-256: c287f56f6e9e0d189a55f937ee28c1af7e25bd20eb332d8a684684ee8ecc6985
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 10948 bytes
SHA-256: 454bfa9655fbbc164ce438559dfc484d098c6f619dabc4e0b250b27f46399770