Malicious PDF — malware analysis report

Static analysis result for SHA-256 38465e983e91bf16…

MALICIOUS

PDF

72.4 KB Created: 2021-09-12 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50465b69304b19300a19eaaf0f07c088 SHA-1: 7ec508fb06fde6b62b215af8abf0be2756995f30 SHA-256: 38465e983e91bf16aabdf608731d2db8254cb2c002366d8b20d6243048b1518a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=dunkirk+movie+free PDF link annotation
    • https://pfhotel.gr/ckfinder/userfiles/files/67385585292.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/zobajameredefokipape.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/29882567784.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/4206689438.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/wawexodasajajaliwa.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/mubabewoxanetod.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aaf6dc6c0---jejide.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/76830830313.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b459c1e---89087592398.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/93819775799.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wugigoborukapinalegan.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/gopupulorine.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/66369155486.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vapexugipobevexu.pdfIn PDF document text
    • http://lgassociates.in/uploads/93919072354.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/56277736514.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jesofifagin.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/siribefuzar.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/42916228670.pdfIn PDF document text
    • http://wernitznigg.at/files/letiziwelivovusugemevu.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904144755.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/buxorubuwutavage.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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 10160 bytes
SHA-256: 2f80b088e656c5bb28ae4a9d6f4d7c3373cb18a0df41744e060cfb68c219c4c6
font_01_sfnt_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 17008 bytes
SHA-256: 7f8608b766c6af70479fc78643e429769b8772cac5c9dee95bb1c7cfe4879da6

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