Malicious PDF — malware analysis report

Static analysis result for SHA-256 5749c2fdaf4844e7…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 08:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f9037c35a7d1b275a9cbbe42bce3181 SHA-1: a069f9e8ff41c6ea22162b63d388791f5ad55ff4 SHA-256: 5749c2fdaf4844e79c9864ac89f66635501fb85a96f714980904c281d34f3aa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mysilo.com/upload/ckfinder/files/fozasovolojejaleruteveka.pdf In PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/ferolejadedobazedu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/ganewisukikitiv.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/12809924327.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/paxuvigixogefaribepewazo.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/86144000904.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/nemunuvalabusepegalugi.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/setam.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16149f96f4d3bf---15208615848.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/14009523276.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210921005124067.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/23595435052.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/94229046529.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/25731100370.pdfIn PDF document text
    • http://clerus.hu/files/file/pozaxetoxafigoxiloza.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/94851069357.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kapumiwamaze.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/ratudo.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/zedofipenadi.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/20748332428.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437cb0a7860---vufagalijefetujurunosavit.pdfIn PDF document text
    • http://origo.ws/userfiles/file/60715089874.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/26480874150.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/gijuledasawotamim.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-9/20210909025434180307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=edit+pdf+offline+androidPDF 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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 10308 bytes
SHA-256: 912f1314d6abd6d9527e18165acc750a5bd962ee5842e2234767cfa88986ef4c
font_01_sfnt_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 17244 bytes
SHA-256: e6f000625bc2861c3f8eb287c55c86ec4132caa5644426e16e88337da6b65b01