Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb664102a8aa65b…

MALICIOUS

PDF

69.7 KB Created: 2021-01-03 13:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ec0e83d58e7b6fd9aa7ec41b76d1c70a SHA-1: d61d361c10c5441999ac5ba3fe8cedc40651de88 SHA-256: 0cb664102a8aa65ba7a3d9f906541d262842b66999e623ef8d5530cfa8bb6933
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 pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafficel.ru/aws?utm_term=dragon+city+guide+apk PDF link annotation
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/6404372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fde2e4763a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5f9abe3b73a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5fcfab6e3a6de.pdfIn PDF document text
    • https://xidabasexibure.weebly.com/uploads/1/3/1/6/131637276/b6ca90c8099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5fe45cec5111f.pdfIn PDF document text
    • https://rutukosawokiw.weebly.com/uploads/1/3/4/3/134318214/3038416.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fee9651d1a07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/58483927427.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/59735287905.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/best_walkie_talkie_app_android.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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 5196 bytes
SHA-256: 318290c4d38f6d2c654cfaead524506ad2ab49c91295af0b2506a905e89bcee2
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 10816 bytes
SHA-256: 14bcf4169d70d836493da3e1a31a13c0782eda114ae6adc7dc4a84c26832393a