Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2bfc04b459933d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 04:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 821457860803714e593b103a57ffb2c1 SHA-1: 8ca14ad8518aa47ceea689ef3f04387b37373380 SHA-256: cd2bfc04b459933d8e8de86824f1f3e9085732cb2f40eb35762c8c81261128f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable domains, indicating a potential link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://fonixkoncert.hu/upload/file/7201367260.pdf In PDF document text
    • http://naturestuff.nl/siteimages/file/85011907933.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/xupobozekapojorexif.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/xuxis.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/20373701702.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/23558041187.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0l46gv8p4gupjmhrp0feb4d8f0/85900708944.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/60605519814.pdfIn PDF document text
    • http://chenruichem.com/upload/files/62688109272.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/17017827691.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/33006614969.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/27768788462.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210907164858.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/36304410293.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/wedoguremim.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/wiwuvixavasodoro.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/vulevafoxobusozadus.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jomobegazovol.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/zokaru.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/800577932.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/kageta.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/99901042667.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/sebopemusuxeri.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/98387610824.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_843433E7A9A1D436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=zinnia+journal+app+androidPDF 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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 17980 bytes
SHA-256: 2d3c23b133b1ab4afa085044b98b4f1f096ad2970504a2f7408224df7bf33fd1
font_01_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 10180 bytes
SHA-256: 42bc6de90f38cef2d6a6d5f4fd7695e0ef8a9c611e52ed291f5d74194585584f