Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a681232b1cd7656…

MALICIOUS

PDF

76.7 KB Created: 2020-12-14 01:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9fb32d1e68633f448d2fbb975731d62c SHA-1: 2089e77a11ead1b0b47f2cce651b55cf6b0bd5bd SHA-256: 4a681232b1cd7656d1869e19e2429404f9c484b5c5e4a8105635ffd03e4b83a5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=macbook+air+i5+vs+i7+performance PDF link annotation
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/fotekowuwoxuleveda.pdfIn PDF document text
    • https://ligefupoluwoka.weebly.com/uploads/1/3/4/8/134888193/moduri.pdfIn PDF document text
    • https://gabonavokelog.weebly.com/uploads/1/3/4/6/134684269/5696964.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/0d9b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fcaf134026b2.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/veragodebarapuvegox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3293732d-afda-42d6-a621-7c88aa9d3c42/jebupir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c95c51-f5d7-4557-9837-b863495ec118/30432962858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a3b055-63c4-47e6-ba5d-897dfab7f379/97979116083.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/xotinewaxukar.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/templates_invoice_excel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 5308 bytes
SHA-256: 8020195cba5842656d776a969772d3ba0ae175b5ff07c0a35743df62fe420cfb
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10592 bytes
SHA-256: 8f105cb681f649df11e30b8b6ac3e7c5d56934eacf022358b7bcaa4b7b27912f
font_02_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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