Malicious PDF — malware analysis report

Static analysis result for SHA-256 1905181cf7ba8701…

MALICIOUS

PDF

80.9 KB Created: 2021-10-07 05:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5083988e8e66601f954eb5af0238c369 SHA-1: 3f078e60fa202ddfbf632328ba3dfc6577042c53 SHA-256: 1905181cf7ba8701757879fe78012a99f173d9a85a8d68f7d8447302394749ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. The high number of external URIs, many pointing to potentially compromised or malicious domains, indicates a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/78769080316.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/nuzawitivubavu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/674522924.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/pazeva.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/feledivenixirofofiw.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/60847099948.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/xomexisilemu.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/40995726095.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/buluvikamejanoxowug.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75cb4421f---mepozazixu.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/32201425583.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/81c4ocm7cbaoppc5rgedjr26u5/jazugobu.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/85737748323.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/fewovojitikadeta.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/73267515087.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/likesoperewa.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/gusikoxanifopagafaxulobuf.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/dotulufiwonaludaxivekubu.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/godituminaniwenuvodok.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/bozufomopozemunuxamuzi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/86919640574.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zuwofisoxatazeni.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/kezumemepozisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=entrepreneurial+small+business+5th+edition+pdf+freePDF 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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 18576 bytes
SHA-256: e4648ca657efd1957b39285e8b7de99e312d6730d1b307e7a3b219eca5ff8997
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 11120 bytes
SHA-256: ea4fffaba013aa4e27895fe1352bd5de4820f981137387255372834780a96fbc