Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b0066389dcadd…

MALICIOUS

PDF

63.5 KB Created: 2021-04-22 04:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0b2d2575603bcd6edda055982fabd1fe SHA-1: 34aaba551045e7b0f1e5318dc5f8a7a2400083cd SHA-256: 841b0066389dcadd57567e9ceba8336775c09ca5fb5248fa6026331d41d0d4b9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.8428

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://nipisod.ru/strik?utm_term=how+to+run+pellet+stove PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6011d4233695b.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/gzsicib/4_word_link_game_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_6055ee7b8be57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_60635629be640.pdfIn PDF document text
    • https://cdn.sqhk.co/mizenopujoli/KgfIZMZ/94768813904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6014c43c76845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_600e26a57c1e7.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/srgixhj/first_strike_t15_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fe6c34f84c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_606549eb0d6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_604ae56d0a8db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_60041d329b55a.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/8104ecc6-157a-4510-b909-06470f07ec76/fodofumodanigesenufipizez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8e73b3-11cf-49de-8468-5d1f7d90a80a/pamerukakul.pdfIn PDF document text
    • http://zotubune.myartsonline.com/how_to_read_an_ebook_on_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d303c2e4-74e8-4bfd-9ff8-a823cf796369/benixuwizuwikufomos.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_335887bef6114e4c986f95f70f694f1d.pdf?index=trueIn PDF document text
    • http://rijonitapadon.myartsonline.com/15348434894.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/62310620868.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_9ab740d786494a7ea63658581bc34ab8.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 4552 bytes
SHA-256: dd6b7bd03cc0efc1de3891adfb3444ea7489323e978c02f8dd4b6e8e2f2723be

Open this report in the interactive analyzer, or submit your own file for analysis.