Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea17eb183426132…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 12:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 59dfc7a5dd1711b7f4032f881537b61b SHA-1: 40c0ff26912a63b29d04840518055af73e21edbf SHA-256: 8ea17eb18342613227105fe80f530b7935fa29e8483c1bccb3544f9fd360eedb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

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 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/award?keyword=dns-323+firmware+smb2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6031d1b1880e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_600a46aba413c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fe2317517b70.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/46079244897.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/2Itjdgg/98689875881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5ffc57d2ae8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fff055342202.pdfIn PDF document text
    • http://creditscoreusa.info/xirutebisorepixew7jkna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_5ffffe5dd62a5.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/99377196884.pdfIn PDF document text
    • http://gooddevice-online.com/32506739998uwz2v.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/zusumezivipudilugonesepu.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/bAtijgd/60919862483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_602affa2d7da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_60184f6e1e153.pdfIn PDF document text
    • http://my-favshoph.online/apk_google_chrome_terbaru_for_pcqeqzz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5440 bytes
SHA-256: c0f3d45db2ae45938e4a057378e8135986c6dc2c8212969770d3abe5217aa96d
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10420 bytes
SHA-256: 3373994e3f56b2dbbbf4268f814462a5c7f9b58a3b6dc7d56fd6d74552da2f1b

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