Malicious PDF — malware analysis report

Static analysis result for SHA-256 9101d8dd35c7f052…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 13:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b07dec2d970679bf5f196822452d1c5 SHA-1: 150ab01a5a69f5397b1c4dc840be97f569e0313a SHA-256: 9101d8dd35c7f052e244696ee47a0fe552d57a0c848bc76d22140078373951ba
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a PDF link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Romeo and Juliet' quiz answers. The presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://trafficel.ru/123?utm_term=romeo+and+juliet+prologue+act+1+quiz+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f893e3cd149a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fd13e2ca0dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_5f90f4fd7e8f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f892d7d3df8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_5faa4cc1de41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fb472001acb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f88772443dbd.pdfIn PDF document text
    • https://kudixofob.weebly.com/uploads/1/3/4/8/134891239/rurimix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5f9d2af862893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fa21238c425a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fb4e157d330b.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/8c856a6c-dbb2-4d28-9372-e5bf0cc35eee/2879151401.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc509327848ba205d335311/t/5fcd53978a55f2188b87b9cc/1607291800342/xezuxuseviwapatusugodaji.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/harriet_tubman_movie_2109.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e92a0a2757459be2ed0b/t/5fc174a3e6d49a06bbc9836b/1606513829767/gajavenotiwufubuzo.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_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 5796 bytes
SHA-256: 752c47cd940b968530ef4b1c042a4a7a64e5887ea3219eba78f4ebef4c3f7ced
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 10000 bytes
SHA-256: b101a7bc05df41d864a3d78fb68aef6d5ced97412624a24dabf578574a17e604

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