Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5de27d1fd5c29b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 20:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f2a1e9866954504a7502ccb409fc4a8 SHA-1: dce8aefb569c7a0e5ebc95843ce9afcc49487e9e SHA-256: 1c5de27d1fd5c29b2722578036a9ead7ba554dc0fec39ffba87d2150ba71a3bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, including a suspicious URL hosted on 'mezovuduw.ru', suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external links and the overall detection indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/123?utm_term=android+apps+on+linux+mint
    • https://cdn-cms.f-static.net/uploads/4472763/normal_6028a219d38e5.pdf
    • https://cdn-cms.f-static.net/uploads/4454824/normal_604d6e1db7a4d.pdf
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/6340256.pdf
    • https://cdn-cms.f-static.net/uploads/4408587/normal_601af93e21e61.pdf
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fd285b0577bc.pdf
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/zawadumumuwifefo.pdf
    • https://vinawulisakuj.weebly.com/uploads/1/3/2/7/132712505/57040634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30611cd4-4d0c-4839-b584-1c604d647217/didibom.pdf
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_3a50b06b5d8640d2bc097026ae903fae.pdf?index=true
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_de4f1fc9b9544ddd85194ff369ad1576.pdf?index=true
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_a2b3685ba2bd4126b98057573e31a244.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_3b089049c52549e0967dab54d218fd73.pdf?index=true
    • https://s3.amazonaws.com/lekezaru/hunter_full_movie_hd.pdf
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_763dbd55900843d9aa45eb5aa4f6c932.pdf?index=true
    • https://s3.amazonaws.com/dosalapasenow/gezekopekizikilidulivu.pdf
    • https://s3.amazonaws.com/memobofilenabon/xunum.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_32e6a19a7931451a8962ddfe11519654.pdf?index=true
    • https://s3.amazonaws.com/zusevamasor/wodonezozufanipafexux.pdf
    • https://uploads.strikinglycdn.com/files/c4cdec9b-a6e0-4d90-a763-9e3efb8e5f31/bevafaterobovinutujorosi.pdf
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_6f31c6c6cf554d9c8786e31e9dd79d1a.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_b76eb6dc54cb4c6f8abe3d46b8e737b7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86413e8b-0dae-4066-8d0d-4baacd5ca2cc/6258525188.pdf
    • https://s3.amazonaws.com/pafiganovavi/bintulu_map_guide.pdf
    • https://uploads.strikinglycdn.com/files/4ddde258-654c-4a02-8837-e5d40d44c7be/36689504683.pdf
    • https://uploads.strikinglycdn.com/files/30689f9e-5903-4048-b8ab-7eb723c5577c/28961500269.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e9.bin
f4cd175ea352575c76cd34876dc67f09a2a51ebe72dfc53c2a4a1b64414a64a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 5164 bytes
font_01_sfnt_off00010966.bin
5407542a0a50457061c4f7f10cbe9cfcf6e1716e9aaecffb7e4e279857e39dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 12020 bytes

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