Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb7e121d190eb2b…

MALICIOUS

PDF

72.8 KB Created: 2021-05-20 10:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14d39a62c8285e7d6f3be326e1a9f33b SHA-1: e214e666f5ecd4a2074970de303db36ecb8a6547 SHA-256: 6bb7e121d190eb2b1a8fe3b39e2b5a00473d05e1e68c164316e6823f8a7a66de
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to direct the user to malicious infrastructure.

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://dafemum.ru/strik?utm_term=sintagmas+nominales+ejercicios+resueltos In PDF document text
    • https://vimarunuwib.weebly.com/uploads/1/3/4/3/134356039/wamiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fe0c1f85db36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5fc69df4f38f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_603ae73b05b02.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/xibikenekage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_6012cd18796d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_600db649e0866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_5fe93e28ac6bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5fe54511ef1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6016e1730c793.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/xifabilejilab/2019_calendar_template_word_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48997d6b-b9ca-43ae-850b-497baa859649/what_is_ecological_developmental_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/56812807036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a39b806-a824-4507-b3b5-59cd24ae8a80/94070891076.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/wibaxufo.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/rainforest_animals_camouflage_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/87804513752.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/derechos_humanos_in_english.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 5300 bytes
SHA-256: 26fb70a04b13a398202e8cc63880291e2588c122a8b198ac48c41ac9b8f3fe53
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11148 bytes
SHA-256: 9583e609c94f9014f34cd4fb611a7c082a890f40199f1a821b8f9acf57ccaa12

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