Malicious PDF — malware analysis report

Static analysis result for SHA-256 290f242ee869d022…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 20:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a8df94dab1063ca6e473397632dad1d SHA-1: 45029a927fea59d17fa444d08319bed1ca05ece5 SHA-256: 290f242ee869d022d6cab866fc0667efc6e093de3c928d7e2fd7aea5a13af121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=ninjago+mod+apk PDF link annotation
    • http://master-sign.ru/ckfinder/userfiles/files/womuvipenigofasobedozuf.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/turatuwotu.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/42814075217.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_45284FA52E62B1A3.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ad912d79---74472847999.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/supeleriwilo.pdfIn PDF document text
    • http://symbolfoods.com/files/file///30957354902.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/toripujukegoxovezuru.pdfIn PDF document text
    • https://atlantidegattico.it/file/gizirokof.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/53790839163.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/29476252873.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/sopilisipofedogaped.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/10533527838.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902071952_2134984699.pdfIn PDF document text
    • http://strap.sk/uploads/files/zovobupililugej.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/lamipenojija.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sanedivo.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/88931717878.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/linuguto.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/difad.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/87486165699.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/47358748017.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/62409276041.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74f9bb086---jepovifogikevos.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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 16588 bytes
SHA-256: e82765195710710674c16b14341428ac21f820ad87934235fea5b585bad05107
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 10388 bytes
SHA-256: 676fc55daadc39af928ac5b7b92a3eb3e02703323396c1ce619e92fbf3576953
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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