Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3de2b588a613a1…

MALICIOUS

PDF

85.4 KB Created: 2021-03-14 19:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc43de97615a3067bf7a87687ea9d4ea SHA-1: 9137fee0652e6e99cfdb3e6b5c30b6a7aebcc2cb SHA-256: ab3de2b588a613a1d6dd3e1ffb54b2968dffc9d30f52f77391603e21daf7c026
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=novena+a+la+sangre+de+cristo+d%25C3%25ADa+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427080/normal_601117683948a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_6009114e3fa24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_60400d0a43961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5fc94dce96346.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/eUgicif/ponogoku.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/gejhxAL/wixatinegomifobal.pdfIn PDF document text
    • http://lighttravel-ng.com/89744253503ov6uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_601879526fe6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60354903bde21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_600bf05367462.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/sipiwisugamodai5hkf.pdfIn PDF document text
    • http://cmbmarketing.agency/american_english_dictionary_appywi4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fdb6ab0cbe6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_60450102b2456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_f5abf907c0bb4f97aa6f589dde3ab7d3.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_d935dabf35ae4611880a9d84606f0fff.pdf?index=trueIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_a9881a9fbc054b38b578886f768c0f56.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_67b2206e0a6644aaa1fcfd500a617f8c.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_5f0a6f92a8fe43bca9d16511166f6c32.pdf?index=trueIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_274a204ccdb1422f983860610f02a7af.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_6fff0a604a754f83a12af6eb3c57873b.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_60dba501e0d648c884e2e69edd63450b.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_14b9e54081ea4fe3bfc3b601890086ec.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_3f7a583c037d45cdae83deacf3cb0bf5.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_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 5324 bytes
SHA-256: e4d77abf66c21bc50b716078a6c011763a65d2e843fdc3365e378ed233809162
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 11568 bytes
SHA-256: 66f3386b99c9e7399b0b6d9f1d8d9cecb02222108b2bcfabc0f91d6ec37f267b