Malicious PDF — malware analysis report

Static analysis result for SHA-256 a676b7c728585470…

MALICIOUS

PDF

71.1 KB Created: 2021-04-13 19:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a551d4c7cccf31d9455d8af5e8f177 SHA-1: 22235c443e204a1415b1a4263ca414a2e27c225c SHA-256: a676b7c728585470953887119d4437fc6a41938ef28e5b0ec3add220ae4650a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URL `https://jacksth.ru/strik?utm_term=always+try+your+best+song` is the primary indicator of a malicious redirect or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=always+try+your+best+song PDF link annotation
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/zabasa.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/ginavaxitefoj-volekelezi.pdfIn PDF document text
    • http://erkutungotu.com/49887507086234ue.pdfIn PDF document text
    • http://airet.space/brother_2270dw_error_lightrw7cd.pdfIn PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/vugowazebasegezibe.pdfIn PDF document text
    • http://summer-italy.fun/war_and_peace_by_leo_tolstoy_book27s2g.pdfIn PDF document text
    • http://dk-inc.xyz/luporojikixilonozoxolajaerzmc.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/kodipopujufipig/tofivogutuvovadojora.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/zifizurojokanof.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_ef1a391cef5248fe8d6d2c6ac788e743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/peradanonemakor.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/non_right_triangle_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/xofuvud.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/filemaker_server_15_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/27001750292.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/77340392631.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/numbered_list_indesign_formatting.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/rofidakubelurije.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_badff3e340304943a6f799efb411296c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/how_do_i_turn_my_camera_on_windows_10.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_c4ba144cb8344d45b6ea5853661c8a1f.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_off0000d88e.bin
668f0f176dd15c58a3cc6be14082ef0774a19f34c879513ac39a4f70d0cb5860		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5176 bytes
font_01_sfnt_off0000ea55.bin
4a7a3c891a5ee1435be81ce4e6a108638584ff267048036edf539f78ea7f1f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 10684 bytes

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