Malicious PDF — malware analysis report

Static analysis result for SHA-256 4444ab096633d0fc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 11:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09f772b4268decc2e8b64f066d11b348 SHA-1: 448e440e55ebf28b6cd109e0a8c4210535e409fd SHA-256: 4444ab096633d0fc261bfefc6848e1d5e6c2a8215ac87acabe6fb08bff0da4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 websites, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=robux+gift+codes+2021 PDF link annotation
    • http://metrocars.london/survey/userfiles/files/1674897344.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/rafisajajefibe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rnb4au0qlgfjuqac225nivgge6/20343365431.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/wotopudewixajejupononik.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/pifedum.pdfIn PDF document text
    • http://ruihuitax.com/files/file/popejadodanufi.pdfIn PDF document text
    • https://hirurgija.me/files/19016929217.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/kobagox.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39282723679.pdfIn PDF document text
    • http://sql110.com/pic/pogaxavobi.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/75563399724.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/98063964903.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/medolakolikiwivulu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xogebudifosisekeve.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d417b16b4d---pabuborotorudevo.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/62055614492.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96066199897.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/881593604.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/25725093674.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/fiwilo.pdfIn PDF document text
    • http://fittbikese.hu/files/file/pininopalimopebopibapen.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_off0000c439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 18928 bytes
SHA-256: ae72930f986b9c2d6596d7f75ab1e4e4e545f71d6663547f2be5a3f6abe28f55
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10920 bytes
SHA-256: b2690212bc3e92be3260e380cd7b36d080cd2592670d619dfd015bc9d4facc26

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