Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4f8c2c5e571cb3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 05:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8adfa30f19ec86d5a8f28de070a85855 SHA-1: 9fb1f48877242e042dfbada515bb93f12c2219c7 SHA-256: be4f8c2c5e571cb3ee431166262b388c0bac56e2dda55e7dfc4c20d3504b88db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+send+long+video+on+whatsapp+android PDF link annotation
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133accc68218---jolulujigunubibuxasasof.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/zabupufivoworekaka.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/muwolipusodezalodil.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210901062358.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/fedoxetuwapofawusopu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/99723525458.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xamed.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/12361369534.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/fametogatebotamowa.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pomatoviwibagot.pdfIn PDF document text
    • https://mmtours.si/uploads/zilaba.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/46738952299.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/79386007807.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/99792178208.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/pokizewojevelabomomev.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/41535310993.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/32964397714.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/pewulomasinebit.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/26682037967.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/76955033264.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e92924f87cf52f881d54ed84f900c9d9/lenumed.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vimoxunatoziv.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/takotirabexenineta.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/rezalojam.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 17228 bytes
SHA-256: eec345b9c9f624cca7d926f22026ffa0ae85ae81c07ed84d3eeb735e6b5f541f
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 10816 bytes
SHA-256: eb33875998e023ba0028a4737a0fa6f5e79e2fafc1767003047e68bcfb84ea85
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1