Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a142dced34ed730…

MALICIOUS

PDF

77.0 KB Created: 2021-06-07 14:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e3b15ac67a287ae20d66e3f45625aff SHA-1: e8741123c8f9ab44c2b4d0513f229a212f97185d SHA-256: 7a142dced34ed730c683d2d3050f354e6207a9c5419fbf6f155ce459ba700de9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content.

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://nomylo.ru/pbw?utm_term=best+full+body+workout+routine+without+equipment PDF link annotation
    • https://zoriliwusitilo.weebly.com/uploads/1/3/4/4/134479822/kudaf_bigini_sipusulubov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601dff46314a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_601e72db383e9.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/soxosiwebigigim-rubokipelenur-fofofinenovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_6044d5312fa17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_6051cc76d8444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6044950c85dab.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/f0219e379c8e.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/1cc36c7f-6256-407b-ae3b-056a828cb602/40094982453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d354702-f2d8-4037-94f3-c90a264d197c/17308567476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9694b8e7-74fd-428a-a9d5-a6d31aef092e/rasub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e4eea8-bfd9-4de2-b5ca-bb88c1302405/sotomakeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e671a3-9d8e-4f2e-9ad8-597e5348e652/tizemepodikaxapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135752c1-c51b-41d2-b20a-5a697ed090f8/parallel_lines_cut_by_a_transversal_solving_equations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434c537e-f486-4c73-b8ce-bba26ccb85f9/beginner_piano_pieces_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d255614-1cad-424c-8e7d-3d64120a8d12/how_to_do_risk_nursing_diagnosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadf30f8-3d29-47ca-b73a-35dc6495b571/wumemubamudawiv.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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 5644 bytes
SHA-256: b24b4b7c637bdfc5d468a94c04e9cf56c4119510e8dae37e0990aa758362905a
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 10792 bytes
SHA-256: 38b7835fcc811de28edfafe9f35a1155ab7e11447576d6b7243f3a01d6f47199

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