Malicious PDF — malware analysis report

Static analysis result for SHA-256 1384a7e7e40028d7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fce6113f06fe34c6cfc48f1d1e8a839 SHA-1: 767999c0d9b5ba77ef366d6ecd70b42ab67f675c SHA-256: 1384a7e7e40028d72ef255254700e6c944544270efeca89bbb8db6c7ce9ba398
146 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, including one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The malformed stream length heuristic further points to exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trystsalonri.com/images/file/68386158956.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/wiliwa.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupunu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/93280733855.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148feda259d0---9699075263.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/39961773614.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/pitewoweg.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-7/20210907230459794464.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/subem.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/81324436244.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bixavowovekixopobedada.pdfIn PDF document text
    • http://epmachine.ru/d/files/luwanogajulimevuxatewat.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/sabarazogoxiwugunixozelul.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/89850851083.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/xolatubelomak.pdfIn PDF document text
    • http://rentaruedas.com/files/others/95305656214.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/45681991141.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/xakinijapatedudijam.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/vevukulitomugitapizofis.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kowozuwosonunadexiwido.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/37609814757.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/faouofeae4n39fq9do1gmfudjp/zibibudabaxuwevufulafu.pdfIn PDF document text
    • http://chromavials.com/d/files/7789325331.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/19524955837.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/40173711213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=big+bang+racing+apkPDF 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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 20700 bytes
SHA-256: 7a5922072f48e1bc155254e1a599b320a017a3dd31efb4318cc5cb2957f8e544
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 10272 bytes
SHA-256: e0470fba4c89394d265f3478b23427dddac3b6bfae32eaa971883a8824080114