Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24ac06e3e124096…

MALICIOUS

PDF

81.7 KB Created: 2021-03-16 05:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1670871c0d328d668e928a782c3668e SHA-1: 929245b2b795a8efeb073214864eef4ca2513be7 SHA-256: b24ac06e3e124096d2103630222aa35eb11ec6123ebdb3fa8e484b5a505ee1ec
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous links, with one prominent example being 'https://cdn.sqhk.co/seseniluvus/yc6nAii/linutoge.pdf', likely intended to redirect the user to a malicious site. The 'SE_INVOICE_LURE' heuristic indicates the document uses a fake invoice or payment pretext to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=sample+legal+advice+letter+to+client+lpc
    • https://cdn.sqhk.co/seseniluvus/yc6nAii/linutoge.pdf
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/xonedarosuzaw.pdf
    • https://cdn.sqhk.co/zimopiroxab/jhRzgji/cd40174_datasheet.pdf
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/6c05a.pdf
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/84660e147114d4.pdf
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/dee8e190e41.pdf
    • https://cdn.sqhk.co/dodamewope/fgcgclf/82941447836.pdf
    • https://cdn.sqhk.co/pejinijew/ixwjfOh/telesubaberemil.pdf
    • https://cdn.sqhk.co/virurewev/jcnxFhg/65060500501.pdf
    • https://cdn.sqhk.co/bodevoposuji/gPdRjeu/zotafojijejixemelikokulos.pdf
    • http://mosomupusafebin.medianewsonline.com/cardiotonicos_y_antiarritmicos.pdf
    • https://xajifopuref.weebly.com/uploads/1/3/3/9/133999146/6795628.pdf
    • http://zumewidife.mygamesonline.org/javanamajugotekusukiwaka.pdf
    • https://cdn.sqhk.co/bodavadu/jqH9c55/65795442249.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4a4b795-3a3a-48d4-9721-f614222d478d/fesalijukomadesijuzofubaj.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_999a053334ca4266acc95152667ff7dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3a4fd773-ff20-4a50-a650-c8134f00f454/where_to_buy_flavors_for_sodastream.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_c29cef9bd6f6445f94f7e26c564cbc84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a4f0c6a-d9ef-430d-a332-c1cbb7dcdcc9/kedinokifutokevom.pdf
    • http://vuxebezedigelun.onlinewebshop.net/manuel_d_apiculture_en_zone_tropicale.pdf
    • http://judiserod.onlinewebshop.net/que_es_un_antipiretico.pdf
    • https://uploads.strikinglycdn.com/files/9a965904-5f3f-4267-868e-31338634a1b7/nice_words_to_describe_the_sun.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_adaf54a039c349728fcb3ef329c19d42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bd242f3c-1edb-4999-bcb3-6a568cb109c1/volca_sample_2_vs_1.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_off00010392.bin
17c9f003606538d4fa1233e9c9b439c214c6de4b12ad398264d5544eeea950bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 5376 bytes
font_01_sfnt_off000115d2.bin
ed2b2465e7a2a5c810e837aca16bc035787d62370748ba31bc266dfd4551c827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 10372 bytes

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