Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd15f1296785611…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 01:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee635e435811221deb447af987f60b6c SHA-1: 2866be12be17889caed3315632bd6656c4d32f6e SHA-256: 2dd15f12967856113346f3f0c705b7b95e85e946a07c866190af83adfef21d5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards a phishing or malware distribution campaign.

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://smidgel.ru/uplcv?utm_term=cinema+123+apk PDF link annotation
    • https://prestinireedcorp.com/userfiles/files/nefulenezusogisebewomo.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210912132819_0ksbm5.pdfIn PDF document text
    • http://adice-area.com/pictures/files/mafejojupomuwotujesewat.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/8090575563.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/dekemuropujov.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/35999775582.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9spffkfg7q7i6u96eck61lkfef/9290585375.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/sogukefax.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/46816943752.pdfIn PDF document text
    • http://mobitransjogja.com/files/wapojupopojavosutupuxipe.pdfIn PDF document text
    • https://medpressa.ru/files/file/furumuzixefoxodemotejepad.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/mudimumafididuse.pdfIn PDF document text
    • http://tiquital.com/documentos/file/45936850797.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/22937827576.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/29476482828.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161390a7966178---rajilesu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/59482961292.pdfIn PDF document text
    • http://pnalog.ru/images/file/44297625895.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/tamonojikobi.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090314570773499.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/64334844443.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/11592965035.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/raketunafarufivujipid.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dofirelupikupaxorezanafod.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/witewusafimawojirasibafit.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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 10348 bytes
SHA-256: c4903bd59496863593ac657eaa5f650a1d7c34e8fb64eb1ceefae337c650a70c
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16504 bytes
SHA-256: 4bffe6a0247c7002910366fa112dbec59b1af85734bc3c39819159c45997939a
font_02_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1