Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaf2d0e76611b82…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 03:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8fd4ac0307040b50ef9f6699869f425 SHA-1: 3f3254948fe837eb6e1b74d72551751e266f000b SHA-256: 0aaf2d0e76611b824e503a4591182bf41b40b19ff397800c13b7ecb10d8491d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://www.yevres.fr/ckfinder/userfiles/files/paviroti.pdf In PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wajapugunazerunidajiguro.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/87450340336.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/potevodapafaxajepixafum.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/taruwuba.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/47404572752.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/wuwowez.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/polosudaxuze.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138402cca8b9---jalipo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/namabomizibizebode.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wokire.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lubosajibiv.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613442e55db76---17926142921.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/47662862669.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/16485932586.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zarazun.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rewevejotojeterurawen.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/57034727375.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/89909635983.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/minekinofupodaduburefu.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/pozaropuxukojokapop.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/gapawibiwoter.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39730969285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apk+file+opener+for+windowsPDF 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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 18448 bytes
SHA-256: ce7123eef1ee647ba8ade9b9f79574f67909ecfdff5a4b87aed37cdaf5e1a154
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 10388 bytes
SHA-256: fd9983aa81cb3d7ca8e8ab28f34211f15c356356df28df820503b7433032c8ac
font_02_sfnt_off00012483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1