Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee530e442a1bdcd1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 23:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cb628eee3ddd05fc2876eaba3cfa62f SHA-1: d329d4085a2ee354fac704171badd73e15ab30bf SHA-256: ee530e442a1bdcd12a94f95f5cdf86e732ee85e45c85c9f27bf17e6c67c937f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high concentration of links on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=android+text+alert+sound PDF link annotation
    • http://morebricks.com/ckfinder/userfiles/files/tirojejixajapasejego.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/dovusenologivupafina.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9153897868.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/zamewawosovix.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/xajofonirizidopip.pdfIn PDF document text
    • https://www.znackakvality.info/files/85512970164.pdfIn PDF document text
    • http://smirna.pl/files/file/balanu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/nufupemobijanufotakuwip.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/24552287954.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/fijiviwidised.pdfIn PDF document text
    • https://granitnet.hu/editor_up/43607189869.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/banafejorizakomisoma.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd5c73f1f---gutesis.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/52396022073.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/soravuroxumadiw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363224d09d4---ramujabuf.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/63947956128.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/verelusovavow.pdfIn PDF document text
    • https://el-tall.pl/pics/file/97049443243.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/37594644525.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/12000840310.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/56534757593.pdfIn PDF document text
    • 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_off0000b467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB467 18420 bytes
SHA-256: 4f53ea37a91843c6a3dd50357ef64675fdfc47f0a60f10affd6985cab43f65c2
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10424 bytes
SHA-256: 9f2a6a5df58434f2855ff7fd740c29d87aa48d2167198a75fa6ba5d90b37d2b9
font_02_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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