Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c47a466561480f8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 00:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be0e6558b44d5ca45fc708fb24e31b10 SHA-1: fe91486ac9ebeaebfeb5fe41fa2767c9f306d4e8 SHA-256: 8c47a466561480f8ec96ab286717fe6c184759388ab4a8de64ad74cc6060ec22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=does+factory+reset+delete+sd+card PDF link annotation
    • https://powermailer.in/userfiles/file/85695638299.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/95171386651.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/11112680048.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140e83274953---suwigeruvevamiwelu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/36641681083.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/woruzorenumur.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/67079819323.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/dojejopepokedodimu.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/65897127245.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/69094806476.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/16250151768.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/91901033124.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/46926814451.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/zorutofateveninezimutoner.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/bogejegetutasefetexunajo.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/laterageloworuneto.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wukesibarifinonemibedip.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/61364020168.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/15800898487.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/tepalomuwoxas.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2h1oqsmgdstv9obdd4eg4meip7/xosixep.pdfIn PDF document text
    • http://crm333.com/documentos/file/lewitenota.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/temepenawaraw.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_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16828 bytes
SHA-256: 986102ac647a6ee4497ea5b7005655dd79dc98610f26d727ffa0717d91c79595
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 10388 bytes
SHA-256: 1e37f927e5b86dfbade1eeddf9021886646feee213637f623cfb83eb220adf60