Malicious PDF — malware analysis report

Static analysis result for SHA-256 219dcc8b8a98cb57…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 16:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9275bdd01413e66d65417d8cb4821894 SHA-1: 347c5cc54c2dee196148b91fbf1dbbbf01c06af8 SHA-256: 219dcc8b8a98cb572f8e27c50977a80b0ca4757b05886a7fa94ff47e8f87e1cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a potential redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by hosting many files on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://yingzhaoliuart.com/upload/file/genelukoziteximewimavefi.pdf In PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/28004270834.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/9415009957.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/29240658512.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/66427843784.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jagafuxadoza.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/40636498767.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/24871678023.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/975446739614821823b4c7.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/37418028919.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kelofejuvizideladago.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/48362777216.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/3551861314.pdfIn PDF document text
    • http://ndt-ultratech.com/files/mutanagitatoxuderedek.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/zapumedemoxuromamomodov.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vovawomapijepuzito.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/77047463798.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/10874332850.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/nomazagidovoxotomivoxi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/darofevuzekoniwebu.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/50396818112.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/surarojofotusuruleluj.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/74762420010.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/27878600247.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/71282359629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+attack+of+the+saiyans+downloadPDF 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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 11248 bytes
SHA-256: f183ae740db1d6f7d619c7b1391fe3c8abe49913ddbc36d4c0cf0f384433e31f
font_01_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 16524 bytes
SHA-256: c5534ee7f298dfa0eff414d7acc405aa0b4d743a536768d3faddc62cddb0fb39
font_02_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1