Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4f57a21dc60752…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 15:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5ee5db50fe91bd7fc7437bb73213e85 SHA-1: d9e809c0253731de831e3a4d00f73eec6fbd392a SHA-256: 9a4f57a21dc607526ac15b04c18f349b9e78b64d9252284b9bb39c084f4cec1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=paket+internet+murah+kartu+as+madura PDF link annotation
    • https://leganordavigliana.com/uploads/file/damatogul.pdfIn PDF document text
    • https://tonitomov.com/picture/file/86311059249.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/jozel.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109040630292292.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210901015536475856jnprrk.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/wiginosoxuralokinovewa.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/98479115690.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/tuzarorojefafupawonune.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fivexapokavu.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210905230644_amFkaXRvZGlsZWRlZmlzZXBvcmVqb2ppZA==.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/27186691769.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/83193269031.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5f15f3c80e35fad27ef05820ee74d01e/lujigudagexol.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/9133721803.pdfIn PDF document text
    • http://wohntraumgmbh.at/sikafarimotugi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fd76466f---xitasanos.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/74017697306.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109052324519240.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/nupesotomasexesa.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/rurowobixezo.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/71619546349.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/79672016114.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/48847659255.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/32523331788.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/safatuw.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_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10540 bytes
SHA-256: 9b30e481b6a51ad4e2fe04f53391737b0b118ede2dd6925f72d55d7a43217793
font_02_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 17912 bytes
SHA-256: c2c39be4a49f1e30e30dd8174c83a1950b2502f7a747dbb586db150a2bd715da