Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9d527667e681fd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-28 23:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0129c6160eaadeac81191445a3ca5b8b SHA-1: ca0d3394742ab465b54021c6bd03a749c6bcbd88 SHA-256: 1b9d527667e681fd7e066e32f444e9626de748c57f3819ce5dd1a493f5d0c73a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=honor+pc+suite PDF link annotation
    • http://fese.in/ienupdimages/images/files/93762771077.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/bewowixi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/noxogovumikenamaxo.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/81171621796.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gobanejibinaviman.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a40ce215---65621208818.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/34714703482.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/wokajenovitidakewugux.pdfIn PDF document text
    • http://julianina.de/upload/file/72632740174.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/xikilodulalezofobamefelu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/75107203188.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/tabamebawupomorodotopat.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/webofedob.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/ruzagitetop.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kuxuzigubapogewomonasak.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/53272146322.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/89803719150.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/88023623115.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/dugom.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306312535757.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/mazunolafolivifopalax.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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 10248 bytes
SHA-256: 5287908c33421de790e390ebb0f3e4094dac7f7b0153c80ecd9ce736abb06bf0
font_01_sfnt_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 19820 bytes
SHA-256: 434daf7a5154a6c1944d268af344ace44f26063b5145de6d53a911b95c7404f6

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