Malicious PDF — malware analysis report

Static analysis result for SHA-256 8381a6a59f8586e4…

MALICIOUS

PDF

68.1 KB Created: 2020-11-27 23:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e67472c9fc071631ade4da5a6badc4a0 SHA-1: 9e02dba13826895cc9a3499376437a13a85bf2c4 SHA-256: 8381a6a59f8586e43c7cf823cc870133b58623a168b769bb09f1248a37a82dc7
156 Risk Score

Malware Insights

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

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 0.9998

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/123?utm_term=at+night+i+think+of+you+dance+compilation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fa18065cc6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5fa8438fb45bd.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/11e08.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/6117b07.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/vidak-fejudulikofab-nafobu.pdfIn PDF document text
    • https://bivajegozu.weebly.com/uploads/1/3/4/5/134598736/jimireza-gadojiboxuxe-vinetabunere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5f9d1b5266f00.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/35b3c3cd1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f97a69425d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f928ca843251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fc027cfb4efe.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/zuxadol/vajurupubopipal.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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 5448 bytes
SHA-256: e0d66a879fd47d39797034dfb4ff6a6422689939f72cfc115c348686f3873996
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 10536 bytes
SHA-256: f816841b0395e65238c1a28fe5fd61fa8aed3a15e484325c452338dd2df8918f