Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3d2296917eeffd…

MALICIOUS

PDF

103.4 KB Created: 2021-03-31 08:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7955abe22cb31a778c832e56641f4776 SHA-1: 64759180831cc14e8ce2b6aac340f73d1b591887 SHA-256: 7a3d2296917eeffd9a41d23eed37c86dee7cbf71f6f10489ee40cb54dd6ad361
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to various websites, likely to manipulate search engine results or host malicious content. The presence of multiple disposable hosting domains and a large number of links suggests a coordinated effort for SEO spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=the+bulletproof+diet+dave+asprey+pdf PDF link annotation
    • http://vapurese.22web.org/best_real_time_stock_market_news.pdfIn PDF document text
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/3010787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60544154b395b.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/b1e137155995.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/cornelius_castoriadis_biografia.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/rikujopixebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_60047669c7de5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6051fcba088b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_60034a0933444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_601b843eee4e1.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/1408218.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/sovavebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5fd3d0d367741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_35d4f939f4a14ba599bba217fef50fad.pdf?index=trueIn PDF document text
    • http://batapijas.myartsonline.com/madina_book_1_vocabulary.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_a909157e31a94ec1bb0b5a96ff3685d0.pdf?index=trueIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_89b50762ef85410e9f00b689d52034a3.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_3d53a0f3d8cf4e43bbb3f76f643961ae.pdf?index=trueIn PDF document text
    • http://mubadel.epizy.com/73190359375.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_018f642f22da45ae9cf2b92f14385c58.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_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 5380 bytes
SHA-256: f68da1b07816e046d293309d6b7704d19fd48d5a963f45e6225e27d5e7709726
font_01_sfnt_off000166d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D7 11724 bytes
SHA-256: e78f2b438c4418d83c4f13aef21670964f086d3c33f28d13c5795a94562d8694