Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb32269550641ba1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-26 11:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e9c0402c8d2c62f22336667c5a67c69a SHA-1: 007e8b3c18d8b601a14a1a4f7334a2006558c91d SHA-256: cb32269550641ba1ef4bdf03643d721929f664a0c6c93b58e79bc32f61544804
186 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm on disposable hosting, suggests the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/wix?keyword=barney+let%2527s+help+mother+goose+spanish PDF link annotation
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/penaj_geluvubedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484639/normal_5fc85eb58718d.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/a4fd5d.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/richard_bandler_libros_gratis.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/best_english_books_for_learning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fff7519a4490.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/35782031399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_604d8b69bd418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_6004eb2cb2fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_605d6fe1db3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_601093a190be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_604404bcbdc07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_ece4e0e3e0694d9b8f114b927873b81f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/924335fa-7192-4be9-bc3f-a5a09eaf8579/rehras_sahib_full_path_mp3_download_-_djpunjab.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_44ae9d0bccb5442e9eed0f9d64e52f92.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c017386a020040a2bdb0fc3ebaa6e6c5.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_2f3ffe40e531492d9fc562e5f53c0dfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdba1a0-2b52-45e0-bd7b-ebc81e10670c/sipatixibowusubamumi.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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5420 bytes
SHA-256: 7c54a8d3fc74e3eaeaf973f8d9c36db293438c687ec1b28d24aea98b56c46377
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11080 bytes
SHA-256: 32d2b493515f1390f211407e8d5a41855e9fb39305efba45b64514abbf845f9b

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