Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34d0657591e4fb0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 07:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d0e272b10a38af2eee33c5dfb86fa13 SHA-1: 2883aa9dbf649591096b89eb3b0466717e0cf759 SHA-256: a34d0657591e4fb0717c6432158b56d786b108a0315818db3562faaeddd6c259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection for phishing and trojan activity. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a distribution or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=best+android+phone+october+2020 PDF link annotation
    • http://mgbig.com/upload_fck/file/2021-9-6/20210906100821704153.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/kijupefilesowi.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/8050561704.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fepoferezorif.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexipumelaxulajufiwu.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/kidesave.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/midawapu.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/24214105729.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/97956424825.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kuwevu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kekebudowabifewal.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/doduzemetutujurozutur.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zurorowesebamakezog.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/falulezuxusuwuxazeza.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/851ffa7665b24b7e0f2e97e3561aee82/suwibuzizelopam.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/15874025739.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sudezixuw.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wefipipexag.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/78780922319.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/45429395412.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/ruwapemenasimo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/97899796285.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/fozamenejo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/3966009043.pdfIn PDF document text
    • http://web5gstore.com/Files/files/27309797361.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zilubovogidiboxanikix.pdfIn PDF document text
    • http://seamacros.com/upload/file/venawasalimebaw.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_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 11000 bytes
SHA-256: 8893ad4dec18783922f6ada68a74038dcc4923f70cabb8bb12b56ac1662c258e
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 17620 bytes
SHA-256: e989e35e6657421936c92e1b9a785a5d891f07500c22baa007f3ea1f1183b9d7
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1