Malicious PDF — malware analysis report

Static analysis result for SHA-256 170f668e89143842…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 12:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7e9c6e77464deeff5362bc3f50cc6301 SHA-1: 5f0f6dc97054d47e7a0f148ed3e79b6d9636edcf SHA-256: 170f668e891438425f96fc1d750a0542c342ce845e299372c04ec69a56c86bee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially malicious websites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.marjojaspers.nl/ckfinder/userfiles/files/nojogovebimu.pdf In PDF document text
    • https://birotex.rs/images/files/tofijawerika.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/33463893237.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/wikesuwapabodijelo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/70943599448.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/puzibul.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/57902969490.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b05dc5896556347b0af239d2b8996596/lafebenajiribufowejujelag.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wotipodajizo.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/46251773311.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rizokejebexi.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kadixajujupaxeduvojol.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6354d5687---lubedu.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/kepumidisa.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/fujug.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/23160871065.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/papawinumogenik.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/tewaxobilimiturik.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/375308161.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/kapatovilitapo.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/sufudetuje.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/xalosupufixudeguvawawol.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91976067383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=samsung+s3+android+latest+versionPDF 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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 11004 bytes
SHA-256: e6938ad2ce99ac5ccf875019dfdde25babb9c2c1501ec6b2d92da48eab69216e
font_01_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 16300 bytes
SHA-256: 7195c63d771241cf494f0552560afb50fff9e23a2a5ff2d6c1c69675216a474d
font_02_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1