Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe05bf16e4dc105d…

MALICIOUS

PDF

80.8 KB Created: 2021-02-25 14:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 01aa0006dda06320e18f9821942fa0c8 SHA-1: 1c2effcb1c98fa06df34212a245d3b4fa2d8242a SHA-256: fe05bf16e4dc105d602ee9462bb0c71884c5b1183e90d61afed69a01ea3e8a69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or use link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/award?keyword=columbus+blue+jackets+news+and+rumors PDF link annotation
    • https://cdn.sqhk.co/powurejur/SgcQPjg/27688017728.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/1aihjjg/63698208883.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/9446924.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/AhaBsez/zomixudumiluxobepib.pdfIn PDF document text
    • http://tajizomekoza.iblogger.org/projects_using_arduino_uno_board.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/bicgjsV/swepco_power_outage_map_shreveport.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/OUgdljB/66449857948.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/dhfEQif/51714643044.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durezalur.epizy.com/webijiluruwiputuvavu.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/38846786852.pdfIn PDF document text
    • http://dikivila.epizy.com/7330973148.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 5364 bytes
SHA-256: 304f77bbf325147090b4e38af8b4729d87847a86c1e3bef6f8391281290b1fa6
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 10684 bytes
SHA-256: f57682527fe63796cb5488f74cb3b7532db68865cbabc39750fac8eab3c3319a