Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd20a4a1ca9814…

MALICIOUS

PDF

73.3 KB Created: 2021-04-14 11:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 52176100bc0acea5f5374df117041450 SHA-1: 1659556e2b8887d05d4a10979ddee21fe26b51c3 SHA-256: ebcd20a4a1ca98149fd2e6f8c47a49d56f345ea2bfe74c59f0999d58b5cf6d29
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=can+you+draw+a+right+isosceles+triangle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fddd383bcc9c.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/bozeberifebaz.pdfIn PDF document text
    • https://futiwetag.weebly.com/uploads/1/3/4/3/134367494/wugijonafe_vexosi_pexipimi_nukokironagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_602df986e4f79.pdfIn PDF document text
    • http://gouliwer.online/how_can_time_management_help_you_during_lockdowndf0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_601ee2b48c3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd3423366771.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/valugana_zazix.pdfIn PDF document text
    • http://jebonefawudo.sportsontheweb.net/gegiji.pdfIn PDF document text
    • http://znakomstva69.space/ba_dum_tss_sound3njw7.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/3504521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4bb1b50b39.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/74a6b715-cc7e-494d-b44d-18e558b6ac27/jebukogokupomexon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ba2fb7-e830-42db-b43a-0d0a042407c9/95602836795.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/iowa_code_714.16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a8f358-099f-4247-a2ce-018b1612cdb8/dokatopukizapijigetokibuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15ff837-1c57-4620-b2da-0068c49d9d26/88254148606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2700b7cd-ed44-4789-95d6-887d043bb955/stihl_sh_86_ce_shredder_vac_blower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8479c598-815c-429f-8a16-d4fe5d300db6/luzesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47cea16-8fa7-44a6-9070-9d7a3110829c/19236465801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c73ddb-1f2f-4a0b-8a69-7c178baa7cde/pokemon_liquid_crystal_location_guide.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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 5300 bytes
SHA-256: 8b8492b20758c609586abf2f740dfaafd2abcca5078a2a0ec7ab12e286cd0842
font_01_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 10988 bytes
SHA-256: 8e0fca1782228a825a906db8c1107020ff170329b770f2bd5eb8a32ad9429e36