Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8ee504735adf10…

MALICIOUS

PDF

102.5 KB Created: 2021-10-12 21:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0019d8baf87472503629b2e58b9d7af SHA-1: 4a4533d459be4c1db288934d70ffc35e50cd8449 SHA-256: 2e8ee504735adf10899749f43cb06a263f16c3f20ae45db3ade3f03f59faa4df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to domains associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=play+along+quotes PDF link annotation
    • https://ssekolkata.com/ckfinder/userfiles/files/zomoduwezinaviwivimigizip.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/boserisuwewura.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/8347261696.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/34759371434.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tapivedurufavubilabok.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/38803367738.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/98941756053.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/zujujiwalisidutiwubeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a088f0b8b2---nobozekivebepepodomex.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/zewoluzidesupibimatokasuz.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/17604007689.pdfIn PDF document text
    • https://aedwea.com/upload/foto/33178562156.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b05e1f0ef8---27553240390.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210918040639.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/56622160338.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16146d92c92aa0---39213414262.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/wogawupiga.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/munurinerululisufupix.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/28976932637.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/tofijuxalimubejekeb.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/489196675.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dudezofibo.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/vapujudutin.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_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 19136 bytes
SHA-256: 725f978a0e006ef16e43d6bdfccdb6701ca30fa893727b34511d7b50c3f4cf42
font_01_sfnt_off00015cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDE 10452 bytes
SHA-256: e7a52840bdb37829b5ed86f0eba8b9ebaa01c0bbbd1ef8c773ee923c1c07d0fc
font_02_sfnt_off0001748f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1748F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1