Malicious PDF — malware analysis report

Static analysis result for SHA-256 507750f0338ea513…

MALICIOUS

PDF

87.1 KB Created: 2021-03-24 16:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a08d55f4bbcf9b52ef568d40ce9e64c6 SHA-1: 2a2f4dad79602c1cd19ce79b1fd203b8f379ae9b SHA-256: 507750f0338ea513f8140d8b261ecff154bae9ac2f39d10a30e502684f268d64
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 0.9996

Heuristics 6

  • 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
  • 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/123?utm_term=simple+android+app+tutorial+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449990/normal_6034e0360269f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_601b454e0194a.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/kipixa.pdfIn PDF document text
    • http://risejesifisem.22web.org/azure_cli_for_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_60306893b2ef7.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/9000543.pdfIn PDF document text
    • https://xiwapidijiz.weebly.com/uploads/1/3/4/5/134511693/foges.pdfIn PDF document text
    • https://kapejipe.weebly.com/uploads/1/3/1/0/131070538/8479892.pdfIn PDF document text
    • https://tevadurut.weebly.com/uploads/1/3/2/6/132682826/6656587.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/972c75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_5ff087e8982bb.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/joworepuxisupitiwamo.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/4573715.pdfIn PDF document text
    • http://nizewapujapoj.22web.org/xopivupawaxo.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/fc9aa70d-c1b4-49db-a402-f77fd2db5985/how_to_create_a_wordpress_website_2020.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_e8cd0914c6af4f55a14bb8090f842e1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eeb9e6b-0116-4412-8cfd-c988d178bc18/wogovakavixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f7fe8d-5a1e-426d-bcd6-9f5fd61f9055/large_big_green_egg_table_for_sale.pdfIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_42a2d4012b914a0c93431b4c8eaf181d.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_5e5bf2676eeb46baa0f327729120128d.pdf?index=trueIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_71e41a93819849f797c8859c94ca6f62.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_7c5986be1fba48d2b1efd4a1c282b60d.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_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 5604 bytes
SHA-256: f906d0cadf0d84176c6551537186cd66a6bc02d1ccc7859393cf2311f8185f72
font_01_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 12052 bytes
SHA-256: 4ee24a08b051d95ed32b703b07532045db982bcaa5b87b91c0d87da2312111d4