Malicious PDF — malware analysis report

Static analysis result for SHA-256 34377efb82bf0921…

MALICIOUS

PDF

69.0 KB Created: 2021-09-10 19:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ebc4873ab76185883a7f43940897255 SHA-1: b1aa5af28486b8a9bbab2a236ef91786c8b54836 SHA-256: 34377efb82bf092189873933f84195978a4427c98ec2e0212754b5602cbe2bec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or engaging in phishing. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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 http://professionalcatererspaul.pageindia.com/resume/cms_files/files/6465816884.pdf
    • http://zeci.nl/im/image/livupogaxukewidud.pdf
    • http://dgjst.com/upfile/file/14217621297.pdf
    • https://smartbrand.ro/mm/file/45113910284.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/19056377891.pdf
    • http://chemonova.com/FCKeditor/file/vanubatetakixaditefu.pdf
    • http://www.zywawiara.pl/pliki/xezipujabijopinim.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133125742deb---83925686012.pdf
    • https://kcharp.com/ckfinder/userfiles/files/32068498550.pdf
    • http://ytbozhuo.com/upload/file/040147217252.pdf
    • https://remont-bez-zabot.ru/files/file/65197212300.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/wofarufefotefimafimepuvog.pdf
    • http://www.anclupnapoli.it/userfiles/file/dejuwakorubipakilo.pdf
    • http://icoenergia.com/userfiles/files/lapojigigeloluxam.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60895781386.pdf
    • https://anukulagrotech.com/userfiles/file/gevasofimememanilori.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/doruxe.pdf
    • http://nitexprofi.cz/userfiles/file/buveluweju.pdf
    • http://pokwuttibut.com/file_media/file_image/file/wabuviv.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9069f2f0d---33611521162.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wikakar.pdf
    • http://tivati.com/uploads/userfiles/file/35850709073.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vafibemaxomerosobizaseke.pdf
    • http://sanmorales.es/userfiles/files/febox.pdf
    • http://ekstelekom.com/userfiles/file/63706113439.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=unlock+private+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b274.bin
4fefc91dfb681669a836140aed69f75c00a25e298616bcc747ef734ca44c7af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 14188 bytes
font_01_sfnt_off0000d58d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
font_02_sfnt_off0000eda4.bin
17704fa2d74c17425bb3b3f092b0dc0bcfadc852892fef0df32a877d5ec27a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 10364 bytes

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