Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4287e8bf5dd6e0d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 23:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf6e96fa7b987bc8824b68fe8eed4fe7 SHA-1: f97a03bb56a0f333be5b8e43fc7b5234bae29e0a SHA-256: e4287e8bf5dd6e0dbe0283f842d63c8b0142d3bb54101cfa296b9b8a19379d3d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=123mkv+a+flying+jatt PDF link annotation
    • https://nhahangthanghuong.com/uploads/files/kefivolavavigokitef.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/44640927937.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kevirijagaj.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/losifuwikul.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sidonurufo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/97144490226.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/41300563477.pdfIn PDF document text
    • https://fong-cai.com/upload/files/rosonolezowuw.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/44915229206.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/xupevasixelami.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66345164745.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/senajapibinigerovedizosu.pdfIn PDF document text
    • http://creationart.hu/files/file/55566536867.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jegipawafukazabowe.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nibegef.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/10916597799.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vezazutanijuzi.pdfIn PDF document text
    • http://leguido.net/files/pudaforezekanezorugokamoj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efcc2d19e9---tibeluwafegewi.pdfIn PDF document text
    • http://ministerium.pt/files/2705217420.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/58089465205.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/30580685406.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/47278794657.pdfIn 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://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_off0000c11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11B 10684 bytes
SHA-256: a9ff94b072f452b4337263391d4ffcd00a5d7196a0803c65ff1a5ed7f2afbeac
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 17496 bytes
SHA-256: a832fffeca5820d8069a92e3a2e2dc8a919631c1ca194ef4da8518435f006e7d