Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b597a5c066df901…

MALICIOUS

PDF

69.3 KB Created: 2020-11-28 03:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5666d126f737fb9ef99c22bff12342fa SHA-1: 71d081840518e1ea036782b5cee82c85dde97fd3 SHA-256: 1b597a5c066df90160dfecc58a5365949a51c16deed1ce8952ecb4767dffe104
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

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://cctraff.ru/aws?utm_term=election+rules+in+india+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464862/normal_5fabb2924acdd.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/nopepej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5fb7bbbe57eef.pdfIn PDF document text
    • https://pepowogipiwud.weebly.com/uploads/1/3/4/3/134344034/vasabisi-dofujuzil-wimulepatuloto-pizaxikibepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f92fa8505ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f9ed9b5215c4.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/04230ccd-024c-4cf5-8e59-247fa89cb7dc/information_technology_for_management_10th_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaacaeb5-7d95-449c-89bf-c82cd3ed08cb/nigagokazati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ae4e68-5cc7-421e-a2f2-05a22f00087f/designer_babies_pros_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2abaa54-e72d-4d1f-8177-6db60ea05b8f/meborijuvebarejirimusuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b713416-4580-4dd2-a5cc-0089adad0f7f/town_of_needham.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4433074-da51-4062-a5cb-a31707362738/dietitian_vs_nutritionist_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4fc7e7-c22f-4dc1-8b08-fbbe2a0df850/50153213794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67237152-417d-4aaa-8fc9-9374799fe655/chef_town_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c913a4-405e-4b6b-9ffe-ecacb4faf356/gundam_seed_destiny_43_english_dub.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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 5108 bytes
SHA-256: d2145283e421a72c01625b0d59ad37a251749694d0f7fb6cf081074d4446fbea
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 10472 bytes
SHA-256: 7e6da55e473c2d066d2750a88a90682659705590533fcca107bb4489f5b4c0ba

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