Malicious PDF — malware analysis report

Static analysis result for SHA-256 6737690746955370…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 00:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c8efe3a05a9d3eb7ad665a8a3747e49 SHA-1: 2089210597d78f9a6eba41ca64eee4aacf6c9298 SHA-256: 6737690746955370d66fc0b8537a17a90e95796f64f2f21166ef595803442f22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the ultimate destination or to host multiple payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.nhabe.com.vn/ckfinder/userfiles/files/39907604328.pdf In PDF document text
    • http://szyuangang.com/UserFiles/file///zifegaxuk.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/7511495890.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109070134231784.pdfIn PDF document text
    • https://frisch.ro/files/file/joneridi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63322903301.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/difupojoroj.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/rilukulajoxubikigiguvaraf.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/tawesowupabolajevijis.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96953800195.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbaa8c92c---73853482758.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39675878861.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340e14a2917---jesunufatuwagofiful.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/dezewexamavone.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/nefirememepuwelizi.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/13596908256.pdfIn PDF document text
    • https://cardolf.ro/files/filakawukulod.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/12882125469.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/manefagilemapukal.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/lutetiwaxo.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/92029364962.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/gafosu.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/bofag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ac+market+pc+download+freePDF link annotation
    • 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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10680 bytes
SHA-256: b9f45c6f01eca941eff11737ce4b071e896e90ca46fdfcd24d0cd0d2feca0272
font_02_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 17064 bytes
SHA-256: 29a82ca80360756120036f68877b32705658e4a55be1c10bee97ed792dc38251

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