Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dfd54654e3a544…

MALICIOUS

PDF

91.1 KB Created: 2021-04-10 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f34d95e18736bcc4e462679bc22c5f26 SHA-1: 7cdcb89c3d5438c26b0a1e81071dbef3c53e91d5 SHA-256: d9dfd54654e3a544b19fab4bd668906ec7256f440fda3127099edd25d3ae31ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to 'gimoguvi.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it functions as a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=derechos+humanos+en+estados+unidos+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6016a513b6f36.pdfIn PDF document text
    • http://moreprodukti.com/chameleon_run_apk_fileje46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_605f549de67bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_60050022d4f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_604d3dd7160a3.pdfIn PDF document text
    • http://gbo.guru/45475503045srx5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_6033fc776773e.pdfIn PDF document text
    • http://shortsomfj.space/bapuwagotua6xi7.pdfIn PDF document text
    • http://shoop-fo.ru/892533838382ctks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_601348dc59d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489588/normal_6029b1c12fc19.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/mefebuwigugivexub55dmf.pdfIn PDF document text
    • http://navalny.design/88605731944ne293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6014a17167467.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/black_s_law_dictionary_7th_edition_free_download.pdfIn PDF document text
    • http://prodson.space/hamilton_cabinet_battle_1_worksheets38ot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_600e32a819988.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/12541687195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_6029d9fa7a376.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/e7dd4858-71a1-4ca2-aa95-0f126c13672a/miller_and_levine_biology_book_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19a98eb-390d-4261-8b88-99600d2f433e/49509900177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb718eba-9f22-4dd0-ad41-360d17a02292/88066830937.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_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 5436 bytes
SHA-256: ac8e9d3d7a080e1b508c3c80deac1e2fb82107c1a3b2f66e7aee0a281cc1d13b
font_01_sfnt_off000135f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 12116 bytes
SHA-256: 036c97a46f7b095457657502a6b9fea8028d661d2c2ccc7e035b1078ce6a43a3

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