Malicious PDF — malware analysis report

Static analysis result for SHA-256 c628ee1c2ffdc288…

MALICIOUS

PDF

92.4 KB Created: 2021-09-08 19:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d6dfc0cb09e1730138c81e7b5745cf96 SHA-1: 15d35b092a94767a76825f0549475f5c5a45145e SHA-256: c628ee1c2ffdc288ce3c1440204858e0935457fac719fe9708429b2edb8e97aa
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 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=manideepam+lyrics+in+telugu+pdf PDF link annotation
    • http://myflora888.com/ck_files/files/dapakovogisimikufebaf.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/19765092206.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/94237886469.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/28936682375.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/sabedubebiritudajupe.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gojaveva.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/48925160680.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/lidibupojozafuva.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/20700535724.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/87912402290.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/satesokujoti.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/65884763812.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19685110166.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/38689365905.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vavelulab.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xudipak.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/25470301560.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dokogifefidadoti.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327c000bb57---46049742954.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/nazepisokixexize.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/3605621078.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/noxiwubu.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/95384520653.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f11ee006c---lilabapijibowotovixipipo.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/zexorukexana.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 22372 bytes
SHA-256: 81a0b17f4943ce77e617008d08304b05520a4df81fecd2a91a3add9255a10007
font_01_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16380 bytes
SHA-256: e62cca045312918b292d130d6dbdb9eee357ae8462ef5226f02e869bf229e283
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 11048 bytes
SHA-256: 0bc971310c484a43d2037f0b95e38e60a4220e52a1fd7757b1c6df219d881069
font_03_sfnt_off00014215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A22 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c