Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fff06023b013bc…

MALICIOUS

PDF

69.8 KB Created: 2021-04-04 16:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c5698d4a713b8626ec7931a6fb0d848 SHA-1: 45c848e9c096a2b765f85fa813e7cd3f8c55c681 SHA-256: 64fff06023b013bc502386300bc990c28087f3e4f0f9b1f65aec0f3dc407b05d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://resalured.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=2005+cadillac+cts+v+coupe+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494875/normal_603d3813d2636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_602b2ae522d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_60287f5326e47.pdfIn PDF document text
    • http://the-job.ru/bewewobuliso96e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_605c3135eaad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_6066a247a0276.pdfIn PDF document text
    • http://getfreecreditreport.info/hobart_4612_meat_grinder_manualcy37d.pdfIn PDF document text
    • http://fudopajir.iblogger.org/29887002943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fd08f6fdfba6.pdfIn PDF document text
    • http://jumpfs.space/14188249436wdtlp.pdfIn PDF document text
    • http://pristav.pro/samsung_galaxy_s5_mini_camera_failedpmz7p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_44b32985485c40abb53a882377a23c15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/465b8895-398a-443f-8b58-2b70efcee9be/los_ros_de_color_prpura_2_1080p_latino.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_ac9a95b9ec98487e946e69b2184ca9d8.pdf?index=trueIn PDF document text
    • http://mitoxewer.epizy.com/kodadomipamozajufapeduw.pdfIn PDF document text
    • http://lubudag.epizy.com/19496751001.pdfIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_f9427cdef31e49a183e50edb0d0f8912.pdf?index=trueIn PDF document text
    • http://fulapokop.epizy.com/ginemixuwunotagelivaxaxu.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/feeling_lonely_whatsapp_status_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba738def-936a-466d-b6e3-ae4869a34f69/giropijisabe.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_ac6b96d8e5a34dfa99b216d5367c3c40.pdf?index=trueIn 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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 5512 bytes
SHA-256: cb705ed02870df7dc8665139bc140e4a722405c44157760a21f82c027f27893e
font_01_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 10372 bytes
SHA-256: 7e300722d98d0bdd6a69f709eb83ec6754f2531b2a3e005d01b86ef1ef87581c