Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7830f98b25ac16…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 20:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e5169d63cde82aa659cd96142866005 SHA-1: 8efb4a4c40c3f1c7888a9f6c9d2dbbe59dc82270 SHA-256: 0b7830f98b25ac167a8bd5ffcaf3cba7ea9a47c7941309d64b9f0006741d8210
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic indicating a PDF phishing/trojan. It contains embedded JavaScript, which is often used to download and execute further malicious content. The numerous external URLs, many pointing to PDF files, suggest a link farm or redirection mechanism to deliver the final payload. The PDF's structure and embedded content strongly indicate it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=android+handy+orten PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f4c5b196---lilobusajedovoniwodux.pdfIn PDF document text
    • http://trieuduong.com/images/Download/kivasugizedesugonulatupiw.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/jezigagadip.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tifufoned.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/sojenexaluzudop.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/niwexezigufafutiwagex.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/19316592320.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pifadafelasigobujexixu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012609f02a---setowezevur.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95148542994.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/8649633605.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mulibapexenumamo.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/84597866104.pdfIn PDF document text
    • http://sungder.com/upload/nulogalosakulujusizo.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/30057260403.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/32074359755.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/8571488059.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/70073696652.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/dulalevo.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/78822151265.pdfIn PDF document text
    • http://retailcop.ca/files/95103407578.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904191109286999cvfws8urd23w.pdfIn PDF document text
    • http://hidropro.hu/upload/damuxiwawizujuxiripilone.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_off0000bb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9A 10224 bytes
SHA-256: fe03be113ea1e1c43cfa1abbe0ff1bc67930edc10c2659efe37faf6b0fdab0c2
font_01_sfnt_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 16332 bytes
SHA-256: d4886cced9c84553b88a8d8c204b3fe22133ad91e4d9103bbb0bc8e823f9b1c0
font_02_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1