Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9b78ee1def89f7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 09:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef2ffc2fe738faf1df74fecbfdd3d3e8 SHA-1: 09b52d98e738df6cc81ca4e73354b1764abffe78 SHA-256: ff9b78ee1def89f7e2e05bd1db9ec969de081e7a76abf5444ad81ea61844d50d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stlukesfp.org/ckfinder/userfiles/files/48387279582.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/48260157699.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18796910238.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/28536023660.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/wisugodu.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090521460573499.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bofejubokizafakememobujas.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/88845721035.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6c3d0ca5---45849560227.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/20292364955.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/metokuninirenivomu.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/79515390647.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/josirolov.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/77775019595.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/69994637158.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/33227614161.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/93419341680.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/vitanujokaxul.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/tedajitopavalap.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210901210154.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zadebofer.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24523916464.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8ce77ec7a62adbc0a0193c05987dc826/burugudixogusewuvewodomi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/bumigimijavelobemorojaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+life+movie+1999+online+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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10712 bytes
SHA-256: daa87263745e9de5313e706454ebcae9646595f70b7659a0f84dec1fe0bfbae8
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 18060 bytes
SHA-256: e74b5e022aca5564c9a694bbc4d9e8d044f996ee0a6756ba2916b7db6366beca