Malicious PDF — malware analysis report

Static analysis result for SHA-256 609e4b1da8ba1355…

MALICIOUS

PDF

70.9 KB Created: 2021-03-31 07:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 06f7b51e85fe7900d2bc6c54f3cca8d6 SHA-1: 266e32bb8fa9543c2694d3aac6fefef2281f0640 SHA-256: 609e4b1da8ba135569e5812cac4432fc70e9a4875aa4e28455e2841b3700ac49
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 hosted on disposable domains, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=how+to+clean+the+dyson+v6+motorhead PDF link annotation
    • http://gisisavodure.22web.org/27392772938.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/gamevarapuzejetezone.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/ecnijgd/building_materials_pictures_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/jaSWTAX/luwob.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/15037965224.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/GMhfPzL/junior_project_management_jobs_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_b292cfa4eda848b9978d39077ee78c09.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_2d665a14f12544f0b96b22251af3ad38.pdf?index=trueIn PDF document text
    • http://duziroro.myartsonline.com/49945285256.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_497e6b78eca14a79aced07c6ddc772b3.pdf?index=trueIn PDF document text
    • http://labilugukaj.rf.gd/87723391615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a092e5-3954-4ee3-8722-993eda7c0f1a/french_in_action_workbook_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75298d08-1405-4c13-a783-e4075df6278c/64485288374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d42db40-08ab-4dd7-8261-5d387a1339ed/xagezakotutin.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_2539b5a5fd094da0a02f0ad0ca4b97a3.pdf?index=trueIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_d303297363364e04bc06ea3b1620557f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2723d6c-f0e1-4ba7-8dfd-2649b1b99b37/wakolurubomabi.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_9d4a12cb9a2b447d95df6d041f774cb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4913abd-e459-4a09-92fc-0e9751096272/wajejekudopivavoz.pdfIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_ee0f3311909f40f9aa8dde4320495ef4.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_35d46e0912f142a684210c152c349a4c.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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 5548 bytes
SHA-256: 6b00942af89cd9d2fe802c0a022d70bc88749cdce46393c06d1e047ec15fb0e7
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10248 bytes
SHA-256: dd2b41f317f130d402c5fe281617fb73c38adf75fbdec4ca29d969ce4eecec13