Malicious PDF — malware analysis report

Static analysis result for SHA-256 856d352a27ef5f40…

MALICIOUS

PDF

82.5 KB Created: 2021-10-19 04:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e2274e2ab8d596c61c1677a887cd6ab SHA-1: 9bf9cc51f6463b6e84fcf850e738c7e39dbee6a4 SHA-256: 856d352a27ef5f40ce08a23c751cf0eb9ff2c8bf9a51bdb7a34dff1a1a773146
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or credential harvesting attempt. The PDF structure and embedded content indicate it's designed to lure users to external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://fengshan-zhennangong.org/upload/ckfinder/files/29344572560.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/suxatuzidolowimisadig.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/75469489043.pdfIn PDF document text
    • https://landi-bg.com/images/file/88384629965.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/47914667424.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/16745100892.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/10634293149.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gaxexezif.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/42574926602.pdfIn PDF document text
    • https://questyme.com/userfiles/file/55974323651.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/39757248771.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/joravuwapezo.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/fozolazuguv.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20211009043430.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/zobegexe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4fab9776c---fowomutuvanasinobol.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/49934393522.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/8662394041.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fuvigedofisojago.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/fufadesem.pdfIn PDF document text
    • http://mlead.net/images/e/file/xuduzelexugefimew.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/34617615962.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/xezabigesagusugi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=cuanto+es+5.10+pies+en+metrosPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/91567081948.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18836 bytes
SHA-256: 105a297454a97d08da877c6959c18727a76411f7838e0c9775e5fbd76176139e
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 10872 bytes
SHA-256: 8ac34063fe7d71016e0e071266dc4dd4e3cac33b9f1e603de8c5e8af66781335

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