Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4d2e0ae2ce7e0b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 23:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7c053333c0d24b88708790f8128f697 SHA-1: 27486b851165262f55a0ddae465641bda2e2d2d2 SHA-256: be4d2e0ae2ce7e0b23803c2c29d25090c0462e13b3a79d0a75782396b6c8f42d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://origo.ws/userfiles/file/joduweguk.pdf In PDF document text
    • http://chiangmai-esc.net/user_img/files/patisusafutoko.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/vusewifimozadojowub.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/mopabugepisujomedezizil.pdfIn PDF document text
    • http://ahknchem.com/upload/files/vixamewojeroketinesi.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/62034505631.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/654560345.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/23535811495.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/56748628362.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109030638158398.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/93174171132.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/36119940442.pdfIn PDF document text
    • https://signika.pl/Upload/file/fivevaxala.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/47537818356.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5229c73972c3f0edcd4ec931b03298b5/38850795186.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/vedinokowevamu.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/76178245421.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/figowa.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/pedalibikidoveputumuz.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/24985641548.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/11020543801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vision+book+forensic+medicine+pdf+downloadPDF 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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 18596 bytes
SHA-256: ed8db8fad6a30929e0c879e2896c3f049113ceb6039142102c0e4c208ec3e0cb
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 10968 bytes
SHA-256: 3a4ddd5aa4394d3d473350506a111ba9aeb3d72134b2840b8d0343094ee35e76

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