Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a9025229dc2018…

MALICIOUS

PDF

76.2 KB Created: 2021-01-12 00:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45687306399708cb51f456b27edece86 SHA-1: 59ab8a4e52621aab25ef387e2823b632879baa24 SHA-256: d5a9025229dc2018da88e582edaec4364aaa4699d1696f4dfdffc4ea7654ef4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://trafficel.ru/aws?utm_term=career+objective+for+performance+tester PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411270/normal_5fa65d6d787ce.pdfIn PDF document text
    • https://site-1243298.mozfiles.com/files/1243298/nokurunirigukixodet.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/tiktok_banned_in_us_date.pdfIn PDF document text
    • https://site-1173285.mozfiles.com/files/1173285/80884392134.pdfIn PDF document text
    • https://site-1206084.mozfiles.com/files/1206084/ofsted_reports_basingstoke_primary_schools.pdfIn PDF document text
    • https://site-1172901.mozfiles.com/files/1172901/fotefepozatufitozamena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5fdf4d091638c.pdfIn PDF document text
    • https://site-1174025.mozfiles.com/files/1174025/adobe_premiere_clip_free_apk.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/93892784104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5fe995129d1dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5fcf686fd49fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fecb756ac9a8.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/kazosikugexutoluma.pdfIn PDF document text
    • https://site-1198426.mozfiles.com/files/1198426/17012979862.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/namedozesisazolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fad316d378d3.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5308 bytes
SHA-256: d72a80fd518213d4e739a6b073cb9d5f04b43d17d60cee83c3f7c8fe2a7c90fb
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10640 bytes
SHA-256: c313c82e11ee3a362ef99d3edbf30607cda6721fe1f7310aab8bac13313a5eda

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