Malicious PDF — malware analysis report

Static analysis result for SHA-256 477df65861d16171…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 03:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d6a755bc9091ade738ea63ea0739704 SHA-1: f1a4ebfd1bad58283ea0ee8f23a655fa200cc9e3 SHA-256: 477df65861d161710811795f964d034cbdea9c9c3d540257251be9b466762e5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure that aims to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://patriciogaete.com/upload/file/tiwipop.pdf In PDF document text
    • http://canshu.dlzj.net/upload/files/20210912075531685806.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/wivudilujaparawuwofe.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/xudoxi.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/suzakavosawobene.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909091606137197.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/17394642013.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/65796960421.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/54854145664.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bifekivodewavodino.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/10036256619.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_03_59_13_7654.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/95895628456.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090423034586.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/78806536268.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/15390495805.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/pujinazukenixujatin.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/juzapir.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///92970089630.pdfIn PDF document text
    • http://markone-tools.com/upload/files/gapefovidasasolowapexi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/85375756480.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/jujotazubefanir.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/75459010172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=emoji+ios+14.5+download+for+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_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 10812 bytes
SHA-256: 650b1fb128122a6ccdd7a85f1fdab809dc5576ae871996107b4531a840aaac3e
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16896 bytes
SHA-256: 01ebe162ecfdf893003ba1e81ea78bb0ab2530dac5a5008c6232fea1293c32c8
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1