Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea06bf41c3791ab…

MALICIOUS

PDF

74.1 KB Created: 2021-03-07 00:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 930abb484904feb92e82ece6e0409d83 SHA-1: 8b497b00cf8d1efc55faf91a395bf35c2ab874ac SHA-256: 6ea06bf41c3791ab13389905cef9f7d1200fb240a32814aee6078cc1ca0fcbb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=vocabulary+builder+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fd6723054bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5ff51dfc05497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466679/normal_5fdda1f45d8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_60306730aef8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_600749f268518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d264753-784e-4503-a3de-b4c974c71aa1/13179394047.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/fefidebobes.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/76006393251.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/duramipij.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/28219048882.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/algebra_1_graphing_linear_equations_worksheet_answers.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_f513087004ec4e019bf7bfe7c599fa2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/023e196c-6ef0-4ce9-a3fd-cd82c87174b6/kezanuwepugelet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed634581-e063-4a56-8cb6-10d04eaa954a/change_windows_xp_product_key_command_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796e5d13-fdaa-4c51-9c26-99dd59f005d9/rajorukalulawegoju.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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5272 bytes
SHA-256: 5745630f6a530b758635056ffab543591edb330efaf8c1a2abca25947c20da1e
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 11024 bytes
SHA-256: 0e5cd31c640fbb08c4d907d7ffef88af69ce285bad4373d3f7771124d6966302

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