Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c78708ade1a6d63…

MALICIOUS

PDF

75.5 KB Created: 2021-03-27 22:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6e1b4554bc38b4edb43fe817f289921 SHA-1: 2e16a842dbbd07a6ce858fd7d83ff981f7af3c95 SHA-256: 8c78708ade1a6d63be53b2caba56e8ab66160cfcde68a3a5f80fac99c0f21372
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of URLs like 'https://golowaki.ru/strik' and 'http://paselon.getenjoyment.net/visoxubogusaruxugugeno.pdf' indicates an attempt to direct the user to malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=oster+toaster+oven+cooking+guide PDF link annotation
    • http://paselon.getenjoyment.net/visoxubogusaruxugugeno.pdfIn PDF document text
    • https://cdn.sqhk.co/jinavefajevo/Uvrjbji/nezusaxifif.pdfIn PDF document text
    • https://cdn.sqhk.co/kowumutajaw/izjghdt/bezesufukisinoditinet.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/jdhgqjb/fabokej.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/dir_615_e3_dd_wrt_firmware.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/djaOVBZ/ableton_live_9_suite_plugins.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jcjgegd/blundstone_boots_womens_size_9.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/domopuxizobofusefewizeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/felomiriwufeb.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_b91415f4f1bb4b93b2536127d5bbf0c9.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_e4d6f8ce408940cbac4bfeca70e702fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/bagovunisumepebejepi.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_bf8ced4542c04ab9843e374554b701cc.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_313bdfe889794f6b9829d383438db08b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/dcs_fisher_paykel_oven_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/59850178708.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/56004323095.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_d766d0a251214ebf9e79e0712348783c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/fedex_expanded_service_international_air_waybill.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/xingamentos_mais_formais.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_0bdf43ec77e3411f956480c218ef326d.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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5228 bytes
SHA-256: e442fd1ef3d582a80bdf854b1fb47d874b76d0f74ecadab9326fe2a4a9074ae8
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10840 bytes
SHA-256: ee5e6189ed2181fd4b9ae6dad8456ec5243415e718b5605094ca21fe40d35642

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