Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbb9d0a6eef9e45…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 17:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 89ad657f12daa92f8da0200900b1eb64 SHA-1: 67dc4f7351a86a4b7a3111b3cf0a50a9801b0fa5 SHA-256: 6cbb9d0a6eef9e4502def535863c9ddcede5db45ac19b1037dd2dd668bb58a5a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=dell+poweredge+r710+power+consumption PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6043d2b363931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd674d5e72db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5fe6226d2505c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_600acb074caac.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/antecedentes_heredofamiliares_historia_clinica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5ff264853861b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_6044a00d556b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_60340421db06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_5fea0e3e32ddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5fc6d1e13f11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_601a5a36c19be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fddc351ca48b.pdfIn PDF document text
    • https://puxinatax.weebly.com/uploads/1/3/5/2/135295704/raziwirajisiki-luginonar-kuruzujone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_600e0bd41d001.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/wodit.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/brother_mfc-9970cdw_printer_driver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_5fe4e1e323da2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_7f5b8a27915745c3b8ab68f8ef02d0c3.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_9dfe2a9f87c146c3bdd51363a69aa8a7.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_c43f4823e3aa4619a6962c1ca2d9f74f.pdf?index=trueIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/75392809619.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/industry_examples_of_big_data.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_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 5548 bytes
SHA-256: ab6f0a65ac177f8359c0df5c604185b8d256b32e7773e0d60f3b9d82cb56fa77
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 11604 bytes
SHA-256: 8af1c01ab698b805728d7e362117ce79882cefa72c4001ebae6293534844130c