Malicious PDF — malware analysis report

Static analysis result for SHA-256 b278ef5eee43afa4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-21 22:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2731099ddc5d3cfae870aed8053619a SHA-1: 1aa94b138be9d507b33f72e4fa98bef1ff4a368d SHA-256: b278ef5eee43afa4992a92e23c9b109af0e8d177727b4d47d4e31c2589325c1a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://vilenefex.ru/strik?utm_term=how+to+set+a+sales+target, is likely part of a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+set+a+sales+target
    • https://cdn-cms.f-static.net/uploads/4403540/normal_601b93a27cb96.pdf
    • https://cdn.sqhk.co/dijabidasu/djhAVic/loud_ringtones_for_iphone_6.pdf
    • http://gapokaro.mywebcommunity.org/barmetro_de_las_amricas_2020.pdf
    • https://cdn.sqhk.co/kokojisip/jjhhfgd/kamevawewawelefugoked.pdf
    • https://cdn.sqhk.co/letijefa/Eifgfgj/97824885052.pdf
    • https://cdn.sqhk.co/jadepibake/wihh26T/jegebomaliwesululubox.pdf
    • https://cdn.sqhk.co/dijogiper/mmgdhmC/nizobisidomixuwitak.pdf
    • https://cdn.sqhk.co/momogajopi/Dgfhajj/43884785750.pdf
    • https://cdn.sqhk.co/jesovolavig/ic9h0sL/51406306203.pdf
    • https://cdn.sqhk.co/vafodagusun/aTjgUjj/zazubi.pdf
    • https://cdn-cms.f-static.net/uploads/4491725/normal_60339f35956b4.pdf
    • https://cdn.sqhk.co/fopajuxalaso/1heEteG/lexikikimemivafapo.pdf
    • https://cdn.sqhk.co/givefugonuw/jfIhjib/wesupinitijovoxo.pdf
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6005b62315736.pdf
    • https://cdn-cms.f-static.net/uploads/4387046/normal_6020b31e307bf.pdf
    • https://cdn.sqhk.co/zunesunatiri/jchchdJ/budavomegolobeja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_b95a3926e3b24029824509c51e7a969c.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_c52e1c6dfef8497a95c632025c7c979b.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_6673900aff7042888513c46101c512dd.pdf?index=true
    • http://gavawekib.myartsonline.com/biblia_catolica_espaol.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_b5c35e48b628445bacda163fe5407f50.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_18879f94d674438ba56ba15c08e8d4a8.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cf.bin
b934dc41e4e574c388ebfb1837e8ab2dda301edc6c8f487b886c0ae53c597344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 4540 bytes
font_01_sfnt_off00010254.bin
791f3d90ed787a7d6c1987fc1b8d6a688bf85bb2cf8c03e588b11cab11f44558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 11772 bytes
font_02_sfnt_off000129b9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 4324 bytes

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