Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cfa8c8e094414c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 12:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b398beb305413222054bdf59025c888 SHA-1: db6f21a4e35a384e6949445ff85c34cc90789133 SHA-256: 16cfa8c8e094414c38ae66b2e8a6c94dd7484d53a865612381e6283a1b407adb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of many external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://irlanc.ru/uplcv?utm_term=pixelcut+ai+graphic+designer+apk+download PDF link annotation
    • http://ticketsperiodico.com/galeria/files/zogunanadilogeputove.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41799385672.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0caae5877---207760402.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/94632695233.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/57902969490.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/63375086351.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vizadop.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bategirapawobeve.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/40220732346.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/64214636775.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/wijutib.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dazizufepirupogo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913020104.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/1919682785.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/biwev.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/53503420342.pdfIn PDF document text
    • https://kratky.eu/files/file/84033622493.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e31e4e3---97433477726.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/watipanajulonoxukukawovoz.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/64438553126.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/nodazodux.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/toxogutaninaripoba.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/xaxateku.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/sixipi.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/70588915902.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/22397846829.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/korememufu.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_off0000b75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75D 17096 bytes
SHA-256: 5fcdd2174bc647769a61901764296c74799b750f9f8423cf08d93373bdc15ce9
font_01_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 11172 bytes
SHA-256: 05ffaa50240d1362ed64bf1bf710b44ffca2166037492b6fe40a7ffd4f0b5b8f
font_02_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1