Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e1fe4fd6f8e745…

MALICIOUS

PDF

93.4 KB Created: 2021-09-12 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8ebe8920d9de52843a89c9982683780 SHA-1: e1b18a3277ef133c7f586adf66fd8c11d6919b0f SHA-256: e4e1fe4fd6f8e745ed877b1108a06d095d067b0196755aaff6bed2659d508b9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The high number of external URIs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://marljivo.hr/userfiles/file/werapewexulasasuxurox.pdf
    • http://gnox.vn/upload/files/megomugokonepozininot.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zufeninewo.pdf
    • http://munnarinfo.in/userfiles/file/58818504486.pdf
    • http://plechotice.sk/tmp/file/43911916759.pdf
    • http://leaguengn.com/userfiles/file///56267617508.pdf
    • http://ski-experience-japan.com/images/blog/file/butiwaganizep.pdf
    • http://toonesk.com/upload/12725332923.pdf
    • https://open-call.fr/uploaded/files/xakapefete.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sksp1mfmepsm9fc2m5idfatusu/1647684754.pdf
    • http://centralgiving.com/media/userfiles/file/xagax.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/rigaka.pdf
    • http://cn-biyoute.com/d/files/soxogiravemuwarutijedes.pdf
    • http://phuketdriveschool.com/userfiles/file/86664026252.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/19830389749.pdf
    • http://hunicorn.hu/userfiles/file/tepitilowiluvapowodamade.pdf
    • http://deccanquest.com/konadnew/userfiles/file/65051046908.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2nc38953va2aelcc0du5rtgutg/mekipite.pdf
    • https://bulgariapools.com/contents/files/32813817110.pdf
    • http://yidaig.com/uploadfile/file/20210905221930.pdf
    • http://goghepcacloai.com/media/ftp/file/vajujebigawe.pdf
    • http://theseadiaries.com/ckfinder/userfiles/files/lejakadivirexelifij.pdf
    • http://ayhancevik.com/images_upload/files/liwoxotenopoj.pdf
    • http://pincesorvarshop.hu/editor_up/fedotukuvigiwomaximobobi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=app+to+open+psd+files+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16792 bytes
font_01_sfnt_off000120be.bin
0d95b01ec168a352bad68f9e7835ed9e752093558d9e9eaaa0460def05fdf7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 18028 bytes
font_02_sfnt_off00014fe7.bin
a050657b7ff234fa83c37a78824753e3c515dc634fec002b5dde4cec13abd764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE7 10472 bytes

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