Malicious PDF — malware analysis report

Static analysis result for SHA-256 2426b5cfd47d5f9f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-24 10:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 96dd3329098007539e1c37c22416eb87 SHA-1: bc081e730282cbf68eda80dd93b28618ec5da835 SHA-256: 2426b5cfd47d5f9f15f4b3b335326e99ea9b26b221a7fcf861515e652991f21d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=hollister+mens+shirt+size+guide PDF link annotation
    • http://dawexefif.getenjoyment.net/64594562928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5feff1f0db7b0.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/9316537438.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/mcgraw_hill_physics_11_textbook_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6026da42191a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_60356d3451334.pdfIn PDF document text
    • http://fomejejavegod.sportsontheweb.net/bonigagusazijusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_6016380c8180e.pdfIn PDF document text
    • http://fosinofabeveso.22web.org/92536934300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_60500c602b56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_604e8e92e9ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60194e21062d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6041bac8762b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_60152812aedfe.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/84362898074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesitebogi.epizy.com/9684190481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389bc416-eaa8-4876-b21b-4879e25880db/86929551752.pdfIn PDF document text
    • http://zujexig.epizy.com/speaking_english_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb2b568-87d8-40a0-831d-f9484e2ad052/mysterious_benedict_society_series_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2505e275-1999-45c3-b268-d044eadc54f7/mapizaxasosagobad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029bdee4-9f89-47f5-9d20-28c1841983a2/64399451055.pdfIn PDF document text
    • http://bigamutalunu.atwebpages.com/remapurupigonabeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb9804e-954c-44f3-b674-d93100c8dc1a/xanufulibi.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_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 5040 bytes
SHA-256: 52c8a5dcc5a449a0b4ff33f0e8bb3731e82e39f41a65c4902ff6b1baff3a5bcf
font_01_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 11700 bytes
SHA-256: cf4e14b4e2384344d7122d05a2fa433101a19b2f357c6b93cf2ae6ceef458a44

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