Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2170d2d18d367bb…

MALICIOUS

PDF

68.9 KB Created: 2021-10-04 07:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cd80c7e29be3ef55bbc8268b5331d9e6 SHA-1: 4201cff5a464401fd3e13cfb8043a2d61f2d2a48 SHA-256: b2170d2d18d367bb3df2b27a2307304b837ca16234bbe7bc8492a12414432f28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://underbutter.cz/download/foto/zirugemebozedajusug.pdf In PDF document text
    • https://ismart99.net/upload/files/rofegobaragatugewunivef.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fafavoxewabotovesusiguxi.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/tirazazilejiromog.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/58033296705.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/43064254042.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021100220113573499.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/67071743181.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/41712687082.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/36419701577.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/bugejajujajijutafij.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/gasusune.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/18109133729.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/46999590430.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/15385651615.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/96574953451.pdfIn PDF document text
    • http://actinq.nl/upload/file/63578931181.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/91358718136.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090105575343.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/35658346426.pdfIn PDF document text
    • http://potlista.com/file/files/3253228566.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/92707273483.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/46439652252.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e85a07df---saxefulumesasuvaduzal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bible+verses+about+passing+examsPDF 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_off0000aed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED4 14904 bytes
SHA-256: 2c17fedc164809966b7352278df319395d61ee82d4bb6222cd4c95eb1e941f96
font_01_sfnt_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 11056 bytes
SHA-256: 3f5d2c4809ea9dc81303803bedb7457d89c01c59169a22733421070bb695a474