Malicious PDF — malware analysis report

Static analysis result for SHA-256 73157e5c2ae371f0…

MALICIOUS

PDF

75.7 KB Created: 2021-04-14 01:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 50f1d7f939487cb212131c47726000c3 SHA-1: 273f83266ba435e2afecb4eae8cdc7aa66bc91f8 SHA-256: 73157e5c2ae371f0e8284363cfc642c1249cb2bc22902bf1acedd81188c502f5
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also indicates a high probability of maliciousness. The document body, though heavily obfuscated, appears to be a lure related to stock market information, directing users to a suspicious URL for further action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7841

Heuristics 4

  • 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
  • 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://resalured.ru/strik?utm_term=will+stock+market+be+open+on+veterans+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6061037049cb0.pdfIn PDF document text
    • http://sodaapp.pro/hp_photosmart_2610_fax_instructions9j01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fd78d6d336c5.pdfIn PDF document text
    • http://1fps.ru/285221428247ic9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5fdc51e89e3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_605183a95cf85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_6034de23c8c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_60167ca2a04ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6059621cbcffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390680/normal_604702b54bec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_601059a94ad36.pdfIn PDF document text
    • http://mailedflkf.site/7126426347wty1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_605807bd6b5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_60479e5bd8b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6015daf98d6ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fd0393914e0d.pdfIn PDF document text
    • http://ideal-it.fun/33180672629kldvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_60137da48d1af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5ff855d4d40b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fefe15c598b0.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/79382560065pxhm7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7917e4b8-e0bc-4a11-bf0c-b6d0e67fdf66/78894709066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bb446e-c151-4272-802f-af29483c6629/eragon_2_full_movie_in_telugu_free_download.pdfIn 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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5600 bytes
SHA-256: 5c9f09bc44f22a26d5e037ef59423ebd9bb1e1cc8daa1622f558f1a8db9c1a52
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11520 bytes
SHA-256: 2c5a267aecffc2a3564a4bab263a9205f22cc46a772425be041b7303e55f0cd3

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