Malicious PDF — malware analysis report

Static analysis result for SHA-256 7552075948d5d63f…

MALICIOUS

PDF

86.1 KB Created: 2021-02-13 07:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2dbd9a5db6a59a3624b8cd6bfcd33d54 SHA-1: 8e0e743c19cb495f929ea286589d06d87f09c006 SHA-256: 7552075948d5d63f1f88b9b7c5162a4d256307529650764fc14379e8f5f88da3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a link farm pointing to potentially malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

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
  • 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://yafferge.ru/123?utm_term=unit+6+exponents+and+exponential+functions+homework+10+simplifying+radicals In PDF document text
    • http://balifruit.com/rig_veda_brahmanasp4xv9.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/50d4d34da1990.pdfIn PDF document text
    • http://ch-redirect.icu/56000437738pht0b.pdfIn PDF document text
    • http://sunshop.pro/xibuwojifideko222w0.pdfIn PDF document text
    • http://complect-tech.ru/cuneiform_script_font_freeglsiu.pdfIn PDF document text
    • http://zuluwana.iblogger.org/wexisosizabimi.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/wupewipimis.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/divelatoxa/creo_parametric_5._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/38271533398.pdfIn PDF document text
    • http://mubaviz.epizy.com/lidusaxeb.pdfIn PDF document text
    • http://lifarodanudu.rf.gd/gipibojivolab.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/sql_report_builder_expression_if_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/bsr_full_form_in_pharma_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/89707594840.pdfIn PDF document text
    • http://labopum.rf.gd/greatest_common_factor_worksheet_with_answer_key.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_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 6236 bytes
SHA-256: eaeabc8f52fba52b16e5760e370dbe7a90388cb1322c4f3017931d154a1ff5e7
font_01_sfnt_off00012244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12244 12036 bytes
SHA-256: ecfd6ca23a843b504469489634ba1b0930f53b7aba8f8d6841cb4332d07d08b5

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