Malicious PDF — malware analysis report

Static analysis result for SHA-256 053e5522f0ed7df6…

MALICIOUS

PDF

67.4 KB Created: 2020-11-23 22:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8b4e3474e0dea2a1bdb2f7c936fef8c6 SHA-1: 189544cca9d0e7147906d656cb6d2db9525ead8b SHA-256: 053e5522f0ed7df61829401c41ac053b4899e0901749db65f665ae170c31fabc
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 several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/strik?utm_term=elementos+comunicativos+en+los+contextos+de+producci%25C3%25B3n+y+recepci%25C3%25B3n In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5fb8db483bd06.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/gexubifepex-jekowesi-wadozoga-kokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5fbad86d42319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5fbacf34d0b77.pdfIn PDF document text
    • https://vapurexox.weebly.com/uploads/1/3/4/8/134865026/7299389.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/fumiposamisur/insurance_certificate_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d00874a-73e3-4de0-8af7-caa5580c5d0e/rilutanevow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11394450-0a25-4191-a453-227085d764b9/gasejepadupeb.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/21686013536.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/39915692747.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/grace_not_perfection.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/42292269362.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/tell_me_about_yourself_interview_answers.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_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 5544 bytes
SHA-256: 6e14198adcfed1d9c06c1cc5e2bcc86d5881312d848969a2cbe73b05dab7d5c4
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 11232 bytes
SHA-256: 21c66f5873dc399fabee41f91030f9e141be056e77069f5e14315580e17c775f

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