Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279ddb62a11e226…

MALICIOUS

PDF

73.3 KB Created: 2021-02-14 20:04:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d7132ad34768195e51f18b4ee8214460 SHA-1: 87697312c39657ac24131e9ca4e1141ef0e8cbe0 SHA-256: d279ddb62a11e2267a45333a8be623b524ef7f70c75053b31fbeb21ad8089219
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards a tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=numax+sfr2190+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5ff5405330266.pdfIn PDF document text
    • http://zurabutodiriwa.22web.org/xateninadodusa.pdfIn PDF document text
    • https://cdn.sqhk.co/wopiwozaso/bicZl8L/67797262734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_6024b155d499f.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/itrk8M6/goal_setter_basketball_hoop_scheels.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/tjigvib/xidumomikafinarusise.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/2625210.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/55553280898.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujisovi.epizy.com/zapovitanakilip.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/block_sites_on_chrome_android.pdfIn PDF document text
    • http://pugijomo.epizy.com/miwuzisudekono.pdfIn PDF document text
    • http://laneneloko.epizy.com/decimal_place_value_expanded_form_worksheets.pdfIn PDF document text
    • http://tabonozekes.epizy.com/lazenukijukubuzopub.pdfIn PDF document text
    • http://sumidemeg.epizy.com/majivipinatekazediva.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/zazelebuvi.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 5552 bytes
SHA-256: 468a36d90e4ada60f8771b7b83588a5a515670d92c4cf5d72faf96bc9caae145
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10212 bytes
SHA-256: 05b5baa7405e39f78fd6d5f62815f48af2982a229626385029b90b6d47726a0e

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