Malicious PDF — malware analysis report

Static analysis result for SHA-256 26995daefb14b465…

MALICIOUS

PDF

87.3 KB Created: 2021-04-03 10:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63eeddf23a1c51d1108b89b4441c0171 SHA-1: d45f4a1bde3e43a7af3625bcffbe24cb4a362705 SHA-256: 26995daefb14b465e5459d78a4d5a6b7c748f7a5915e4aaa27aab17a81dc7f28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=lose+yourself+eminem+lyrics+karaoke+clean
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5fe424677e9ae.pdf
    • http://hq-cleartv.info/regression_testing_template_document3kz72.pdf
    • https://cdn.sqhk.co/moxulofilose/l5gcUjd/rec_screen_recorder_hd_download.pdf
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6032904599e9e.pdf
    • https://cdn-cms.f-static.net/uploads/4374366/normal_604342a1e6525.pdf
    • https://cdn-cms.f-static.net/uploads/4369330/normal_6036cf2f3be6a.pdf
    • https://cdn-cms.f-static.net/uploads/4486201/normal_60518fbe0bad3.pdf
    • https://cdn.sqhk.co/noviraxat/hhhgJci/zisesexovafikinisus.pdf
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fe080c312f90.pdf
    • https://cdn-cms.f-static.net/uploads/4470962/normal_605f7194c8628.pdf
    • https://cdn.sqhk.co/goganededem/blJhbhj/best_drought_proof_plants.pdf
    • https://cdn-cms.f-static.net/uploads/4500911/normal_602214f42547f.pdf
    • http://yoga-fitness.space/archery_store_salem_oregon77tjd.pdf
    • https://cdn.sqhk.co/wemegofuk/jgGigjb/38805232877.pdf
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600e13726bb03.pdf
    • http://futup.ru/nifogitavifofodk6fbn.pdf
    • http://fbdirect.site/mibokasisuvelijn1mg1.pdf
    • https://cdn-cms.f-static.net/uploads/4496015/normal_601830c00c84e.pdf
    • https://cdn.sqhk.co/vuvapolaxaj/cBheGhi/xusekaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_86255db6997f4ca3b6b470f2015521c4.pdf?index=true
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_63bf8ec852ac47ed8f8ab87333239f6b.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_46edcfbdebf143f8a4e799d375565766.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_65b31468274a4964bd401fa6a4a04527.pdf?index=true
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_7a792a61adc448259a0e25c1b2889eee.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_fbf25fa0da244abeb8e87cb3bfd1111d.pdf?index=true
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_d68eed710839484b82d6bd965efeee45.pdf?index=true
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_6614cea8ce634ac18cf30225d961d011.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e5.bin
c1774d7f16070a4b68400707773e1bdfb8982336dbb1d01a81034c5dd47bf3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5132 bytes
font_01_sfnt_off00010b55.bin
5f614664d3f1561753e86a2cb927648116a5290dd076357bc0fb64e46b7da0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10360 bytes
font_02_sfnt_off00012f33.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 18776 bytes

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