Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8b362c4d02d3c4…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 20:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3ab4ff8f9b0f7b2afe4bb9b0f96df65a SHA-1: 80e8abcc91ac30c9daf7c910c22e70ccaa84e665 SHA-256: 9b8b362c4d02d3c4080c2ec42ae1eaba954686062056470fe0fa9e67fa58cbe6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF structure are consistent with a malicious document designed to redirect users to potentially harmful content.

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://lozipotod.ru/award?keyword=guide+astronomie+debutant+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465262/normal_605825a915bff.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/1815963.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/4089842.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/xibukogozol-pamodofur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fe3ff66378db.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/jaje3ev/13542804633.pdfIn PDF document text
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/xozemukebiremon_wakebaxejabixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fe24be137d08.pdfIn PDF document text
    • https://sokudepan.weebly.com/uploads/1/3/1/8/131871622/sebimax.pdfIn PDF document text
    • https://cdn.sqhk.co/zonumofil/agdrgfV/muwiwumajuleva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_43853fede33f4106b4f4f0e116d6110c.pdf?index=trueIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_d7b6b7ef99db4cbf967350a2b51883f7.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_a0d03f6bab244e4db50a7fb40f28bf58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/805db12d-0b02-4bfe-986f-9c97fe47cb49/mugusemokodazebejutaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0aa6075-0e99-466b-872a-ac77a86a7083/halloween_gimp_mask.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_a1713d4e81c14a61aa763eeebab2b35a.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_1dc21230db654727b52d4f6a37c0e039.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db65af2-d729-431a-8416-39a2160b3ccf/61742625495.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_806922a93dff4455959c657ce714f459.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb1cd47-404a-431c-837e-d92761a4da24/sebesifazevod.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5328 bytes
SHA-256: ada3c2a5f6af9bf97d01e2cdc207905d5cd23596f74e825711db9b574b38c1a7
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 12732 bytes
SHA-256: 4af702080db55c43c8e8b52c8eda7d1c814e8a3bdfd05820d3e3ad553e5f50ea