Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da5fd922ebaea75…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 10:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4e01d87f86dfa2758e67f4b0f38cea05 SHA-1: cad69c99171f81f4b0490b19af12acadaa06e165 SHA-256: 0da5fd922ebaea75dae2ddbe0ab1c8cdbe83236d7ac431b9dd29dcc9b9a7cf31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=tutuapp+alternative+android PDF link annotation
    • http://fine-cottage.ru/userfiles/files/40757046498.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/xuwolizodoxizet.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/25602861770.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/tivogatabuxukasatuvupav.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/logopel.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/72105121090.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/lulujuripuvaseratipiz.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/futolefomasufazaxurusoxa.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kumejowibapajozadobexaw.pdfIn PDF document text
    • http://lblussana.it/images/file/5439169190.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///3051028379.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/25816047752.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/74920182727.pdfIn PDF document text
    • http://ijfbn.com/editor_up/lalokirowuluburomefinop.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464400256fa---durot.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/70327441076.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/gusetuzexip.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/purereg.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zexomepemuxajago.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/zukutanadad.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/pudunezimotajorafe.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vitopexarevo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/zapaxik.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/gajobakun.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/mojarekevulozidobuxa.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_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 16616 bytes
SHA-256: 9df4bbe3f71d8c5c892f436e3762ed59e225e76c66c866116fe74582b4c7670f
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10344 bytes
SHA-256: 209e6c981dc59f7701d89696c083edae36cb62bb3040bc799fffe4b1dd56b7a5
font_02_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1