Malicious PDF — malware analysis report

Static analysis result for SHA-256 743e70935bbc2f6d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 01:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6133365216ae3bf64ae575aa04b7c130 SHA-1: a232e3faefdfd01d6f4b9a3f768e15b1e0f0e18a SHA-256: 743e70935bbc2f6d475172a9aa4d7b7d11cfdec302876d7b39dd1a20c360957c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with link farming and potentially phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://resalured.ru/award?keyword=guia+de+ejercicios+de+calistenia+pdf PDF link annotation
    • http://rajonilelubej.22web.org/herman_miller_aeron_chair_size_a_b_c.pdfIn PDF document text
    • http://wojifos.22web.org/72438184430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_02b0d19541924999b58e2e25a3f7d841.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/ahsoka_novel_canon.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/gezemafumugisapumon.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_6c2549fa19024228aa2b4d5f45d9295f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/8363385299.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/68694624946.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/kipeduxadesef.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_62773e5ec9df4290b58415b2c4417d77.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_f2e1c9997fc34494b33eb3b5151ae6d2.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_c94bcbfb30284e77a5626268775d44e4.pdf?index=trueIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_23a467b9f4e8470c952bf5efdea8f6f1.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_2bbe6aec8d414a72b49f08ef105a16d4.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_958eccf3fcb8445bac7c8133e863e49a.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_b255246fa2ed4cec9bcf7837e1e55fc9.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_92cf0c620bee46d1bbd08393c40d6d6a.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_551bf6f1d5fe4d89981e9013e8ed8c6c.pdf?index=trueIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_b55d3e15a97f46c889bb12cdb7511aad.pdf?index=trueIn 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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 5256 bytes
SHA-256: 21405b65925ed68bab3dc1e8922a9b89e63e250205124300f034fd84895a9403
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 12476 bytes
SHA-256: ddb67225feead8c43fe8d4585440c099aa0edbd172c0323126bca15285dfc9db

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