Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cca0d872379558d…

MALICIOUS

PDF

78.7 KB Created: 2020-12-19 16:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90aab6ecb6a6aeb19db988d5b8b393da SHA-1: 2bb9e97e394db112c59e111be85561265188cd77 SHA-256: 2cca0d872379558d32ec74bff2c43e471ca5ce20cd329ae402a2cce165fbbcf3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate this malicious intent.

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://trafftec.ru/strik?utm_term=the+world+on+the+turtle%2527s+back PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5f9fd188105e9.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5fbf68747d1e2.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/92743dee89a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464529/normal_5fcd700f8dcb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5fcb68536b6f9.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/digevewunulol-muzamotivix-tojivinuwop.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/vejoxiwipeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486193/normal_5fc5524f9199d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fa634cf14e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f8d26a33a769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fd2e00020922.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/guxosa/85653538382.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 5304 bytes
SHA-256: 7f4c3747bea3f5ae4d3c1f757548cbe9d7fe22b8d731f3bb1e938ae1ed8659a4
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10192 bytes
SHA-256: cb90d325c2efef0f3e07ed5abf42193a86929b56b701e452c990586046a425d4
font_02_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 16060 bytes
SHA-256: c507864d0aadc315dba4d342c7d7a7f310c5c701dcd85fab0ffb90b3504392a7

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