Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5ed501ebd61a17…

MALICIOUS

PDF

87.7 KB Created: 2021-10-13 23:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4a485c6b534dc45931ba5b5adfd46e68 SHA-1: a20180a83baaccba377f560795b365cf2ad6a68f SHA-256: 6c5ed501ebd61a1754110e28a2f0274cb50aaaa95951403cd948490f95a2b709
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to the embedded script and URL patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mptech.vn/ckfinder/userfiles/files/52834386441.pdf In PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/34589768769.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/pobenumes.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/87255834345.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/42571606078.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/wowadifagibobaxoberulozob.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/43524927684.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/povudaxokisexigi.pdfIn PDF document text
    • http://mobitransjogja.com/files/puverirajozinuzajupomote.pdfIn PDF document text
    • https://webhosting4.net/media/file/dumodofuzax.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109251422581382.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/legimiromekilobefos.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kuvnanhpqkdphkcus4i6m343p6/99978817258.pdfIn PDF document text
    • http://miminku2.com/contents/files/65546808731.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/zigutamelesetazo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pupujofogezisomabalewawi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595a7ce878a---saravuzi.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/farixufosabun.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16339275324771.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/83375084960.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=grey+cat+white+paws+breedPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10720 bytes
SHA-256: aacc0ce36589c5e4cf6973c8545fdbbfa6dd8b545ecb9951c510c9a5b4010f02
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 18436 bytes
SHA-256: e3f56fe872ba5635e33526a254cb4f937c8e754d4e2cc130d833e0f8f2185e73
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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