Malicious PDF — malware analysis report

Static analysis result for SHA-256 441f83f622e7e3a5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 03:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4e4ff62d69b1f205df9948756464d30 SHA-1: 99582bfbbe272d5722fb9caef205cce7cb3b022a SHA-256: 441f83f622e7e3a50a72066a3209a8483e69e3da5bd05620bff1d0adb054b22c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to exploit vulnerabilities for client execution. The presence of numerous URLs, many pointing to PDF files on various domains, suggests a phishing or malware distribution campaign. The JavaScript action is the primary indicator of malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://ginzaramen.us/uploads/files/nowugivuwa.pdf In PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/niramevevexona.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zopemelipunijuj.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/ponibobuxise.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/24526299067.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/15659774194.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vezazofox.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/80301304656.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/rejat.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/79829413316.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/pojorujokereduxawut.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/71067005086.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79808140968.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/005cc6cf1b7fc7d1d8fd1dc05532d0a6/97281804250.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/6566322714.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/lanunazu.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/puvademibefoviwolawesusi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/lojewikuzilasodenexevigo.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/99322157476.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/luxatarekawixesiwaf.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/xorezereloxiwamo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/2971531004.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/mefaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sport+streams+sitesPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10340 bytes
SHA-256: 331e4c6b35ee01e77ebd62e444c3b1176ffff612ea1007db06c206f0499a7fab
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 17944 bytes
SHA-256: 4a4ff3c36cbbaf20e8fbb4f0f0c2e33da7a799e373bbc86985a942bf2f668616
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1