Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71d8860590359eb…

MALICIOUS

PDF

58.6 KB Created: 2020-11-20 06:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a4298b6439e2e90de85d1f37686090d6 SHA-1: ecb1798fabea6ab0cd428bd9a9c57e63000d5219 SHA-256: d71d8860590359eb91cdf012fa16a65dbdf5feb3d82c18fa96c2105c1252c5f7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest the primary goal is to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=krys+ottino+ymca In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f86fa4b7d669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f96585247827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f8d28e5c4674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5faefec5c9c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fa117ffc15e3.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/duweg.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/binafowetedetoki.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/papagubebaburo.pdfIn PDF document text
    • https://kerijene.weebly.com/uploads/1/3/4/3/134367262/josururusikix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f8db4ca012a9.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/fogosotitili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa17b7c34d45.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/libowebujakux/detugugepitebenila.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_off0000aab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB2 4984 bytes
SHA-256: 99bd041787caf4e7edc42d9a1881d3a805674027a47a9d4ed3315247d6cbe2ea
font_01_sfnt_off0000bb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9B 9928 bytes
SHA-256: 7acd3377abdd22531082a7d46e7d2012e07f81fa4582d259ac57b435667935ca

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