Malicious PDF — malware analysis report

Static analysis result for SHA-256 da666a0e02086e15…

MALICIOUS

PDF

78.7 KB Created: 2020-12-30 00:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e1811372e64a935027ccd4ecf499d900 SHA-1: edbce98f76c3a9841e9137490bec4e2c8dbec2c0 SHA-256: da666a0e02086e151ec9ca7d03ea0ca10a862e60394953cdc136c9c2929851e7
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on link farm domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' further support that this document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wayne+winston+operations+research+solution+manual+pdf PDF link annotation
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/nelej.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/hjeXniP/49175010600.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/icgijd8/16976103965.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/ijRSagi/10701457873.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/fZgcejg/hungry_shark_vr_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f9eb37416d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe43494a37f3.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/jjaibjh/dulog.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/UhQlVDP/75328625541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fca206b40995.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/hfNChef/21473163955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_5fe86707e35db.pdfIn PDF document text
    • https://rovufeku.weebly.com/uploads/1/3/4/6/134636625/vamipalububo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fd8e69918905.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/dHgghhk/wivolijajozixiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5fd27b2a4ff0d.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/xibhc4u/34425498836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8744fcc30ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5604 bytes
SHA-256: ab080299cd90e2d7c42d3833ff586524f090e0d8eff1a5808211bb6e66f5c86c
font_01_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 12100 bytes
SHA-256: 34999e0538c7cd906c9e165a84eb13e1dfe869b656e1d5c5b1f8db7f1d034d12

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