Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d53ff8a08f0456b…

MALICIOUS

PDF

85.0 KB Created: 2021-05-18 04:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a385a24d65afa233d19370c9a4ff1de SHA-1: 5f26e19ac14bf456cd0c90f4dd98218161a46d07 SHA-256: 5d53ff8a08f0456bc16730f4d1d33a29013e7fe1fffa98d1d7702026abfe7e65
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/strik?utm_term=dulces+mentiras+amargas+verdades+4+e+por+amor+pdf+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fd2da19b19d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_603e6641e20a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6043bb0cd0fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6018a70e45b75.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/9796421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366302/normal_5fff0ee1584e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_6052cfc2946c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_605686a338a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_603920ff0a6ad.pdfIn PDF document text
    • http://nodozavi.iblogger.org/consumer_reports_reliable_cars_2018.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/a422bda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_606b802b1a3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_602b98361148f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_6012a787eb6a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_60382b0740f63.pdfIn PDF document text
    • https://borojumalagug.weebly.com/uploads/1/3/7/5/137514336/e6435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fe8c9b97a9ea.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/42fec2ed2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9242a139-5c5c-4840-ae15-43b362c2cea3/pdf_maker_movie_app_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f2f3c8-21b9-4cf1-bd57-fcf7589b194a/20501582861.pdfIn PDF document text
    • http://nareboveridur.epizy.com/calibre_free_for_android.pdfIn PDF document text
    • http://daloketo.epizy.com/29_card_game_offline_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466c2893-7784-4d3d-a99a-8e1390f394b9/fivokirufejutapuku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5504 bytes
SHA-256: 5faa820c813a75ec4e9ab90a095df9a517bd36d26c8320feb7e88a2f12541f56
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 2700 bytes
SHA-256: 74988597827c6aabb05046133f92f122672569cd94ab93107825138afed182fa
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11836 bytes
SHA-256: 33259e0169ac851e94db7d31becc67b5b7f01f07241a9834a1fbbaf6f2afc3fb
font_03_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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