Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66bcc8e40d9381a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 06:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c77f02b79e6358f8afb077e3f7e7fa89 SHA-1: 1a81318f9e194ffe294bb780e4045a51ddd9fde0 SHA-256: e66bcc8e40d9381a6a43133cdb35000c8ea9b65af07dba4860c9f2ed2b11983f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection point towards a phishing or malware distribution attempt.

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 http://myxroad.net/upload/userfiles/file///lugeguf.pdf In PDF document text
    • http://csc0512.com/userfiles/file/20210908155614_a0bl8m.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/84789733218.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/mixokuxagorifutefewe.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/59118088259.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/90456011773.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/43086665014.pdfIn PDF document text
    • http://platcometals.com/images/file/21875951965.pdfIn PDF document text
    • http://posuni.com/userfiles/file/612408956.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kadupibunulisixekededagaf.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/41452253190.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd89f778d7---jumegunabozezenebuj.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/38069812868.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/54892874065.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/powemurari.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/gipixiwerinisisisipinen.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mimevuvo.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/81833098449.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xulanuboxozi.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/98493200234.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodamufebo.pdfIn PDF document text
    • http://pasaru.com/upload/files/pirasifasiwimuro.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/72735011869.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/80367618006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+developer+optionsPDF 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_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 10272 bytes
SHA-256: 1413a0efe3dfa648c6a19be996c9a8f5778ef63ac96a9eb80dc2b0a590c20354
font_01_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 16652 bytes
SHA-256: dee029051243bb8a462de57f8e0212e27926989c6e6c4a35bd259a1c587a9980