Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce27e576da6e621f…

MALICIOUS

PDF

69.3 KB Created: 2020-11-18 18:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272f2fdbe2ce24b688ef43ed30d92cc6 SHA-1: 1bf314beb1c1e0345bb35ceb35b7fb5328cf0bc0 SHA-256: ce27e576da6e621f6ebea2c4a6ad9c65f1570832211c438b831bfc5fe2f1c8a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically a 'PDF link farm', suggests a phishing or SEO poisoning attack. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=android+hacked+games+apk+free+download+clash+of+clans
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bc2cb.pdf
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/3994784.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/c02036eab.pdf
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/6116436.pdf
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/bovetokeselivu.pdf
    • https://sefuxogam.weebly.com/uploads/1/3/4/4/134466031/vepuzeledupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gisujubolidine/cms_mandatory_hai_reporting.pdf
    • https://s3.amazonaws.com/newopetusam/29524077474.pdf
    • https://uploads.strikinglycdn.com/files/a85361a2-5992-450f-9fd9-20bed7286f37/dafukopujajofusoxuwemo.pdf
    • https://uploads.strikinglycdn.com/files/fbbe986f-8109-4fc4-be80-fc090a6b0805/kiludi.pdf
    • https://s3.amazonaws.com/zaxawetawupo/estaciones_del_ano_ppt.pdf
    • https://uploads.strikinglycdn.com/files/26a94846-ea1c-476e-ae4a-9444457ee831/josavifuwatinejaseluzo.pdf
    • https://uploads.strikinglycdn.com/files/6893b3e2-324b-4800-9a65-14ff8cb89af8/50987678878.pdf
    • https://s3.amazonaws.com/henghuili-files2/cetoacidosis_diabetica_2019_ada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdbe.bin
7bf6fcb70f0fc26363dfb4a5888c6e7ec9b62d5bc7d576dc6540728916cb8fee
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 5712 bytes
font_01_sfnt_off0000e11b.bin
2f4c2bbaae629c2a0ca4463b9c7c5baef22e245f1779e9ec1f5ea578e0d1dfed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10956 bytes