Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13c7b717106a407…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 22:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da6f1e25e1e2d7a44073f207e3f194cb SHA-1: aa270483a1ffeebee7f4a7ad313fa4964c62e808 SHA-256: c13c7b717106a407d34206a93761e418c1540b2d45439858d764065da5b4a0c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one URL containing 'utm_term_redirector=True'. While no scripts were directly extracted, the PDF structure and its classification suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rilbmfc87epf01e1ja5p7u6fl3/53489692151.pdf In PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/5263109400.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/lelomini.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/paforinopez.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/vozotogubaxexaxis.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/51403774422.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fuxazoxogiboturap.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tiloxaromexaxesadiwo.pdfIn PDF document text
    • https://12tiga.com/contents/files/dagoxigesavalado.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/46379582313.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/liwinevomuxosuzabo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tesujodivofomiravi.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/rimeleralajar.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/99440635854.pdfIn PDF document text
    • https://majubesar.com/contents/files/2319225601.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/rijefudazususagemogew.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/garafinigetoxirizow.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/10918017404.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/28047979301.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27033873290.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/todupeli.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/dalajijeginibiwu.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/xopesekidonikararapafume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=simple+qr+code+generator+freePDF 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_off0000ae88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE88 11016 bytes
SHA-256: c19ebe718eb0db3be45f29d3bd46b7e53a3c4cb3fa989126230ddbeab010d8fe
font_01_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 15932 bytes
SHA-256: 730f33f39c5af5928ebd4b25d2124680c3b956b4cd2ce390f3953005a16737dd
font_02_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1