Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6597adeb10b0e5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 14:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ac3e2f3eae3dbfadf203414151c0c5c SHA-1: 24911534adfcace8bbee2880b2d463b15bfdd164 SHA-256: 4b6597adeb10b0e58837d940da4f8b63a94b7bc83c9e90ef9560d9395246c592
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 structured to appear as download links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute files or phish users. The embedded JavaScript likely facilitates the execution of malicious code or redirects to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=free+youtube+downloader+para+android PDF link annotation
    • https://mwasafat.com/uploads/files/72357678137.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/24769485388.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/funizimexoxulir.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/kipizofekego.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210912083137.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/91945643093.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/woxurukivupolepi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613842dbd8496---48728799068.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/jarup.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/61271891915.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/wodof.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/42925343644.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/83903222159.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/3484737256.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/99043072746.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/29753010886.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/15087561276.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dae10fbf---6662553911.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/74473835957.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/21315990016.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/67120992780.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/75342557090.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_off0000be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 18012 bytes
SHA-256: e0351d3da9cb92a46f08c32a1c797da5afdd7f1a60b1179b9f2655f6a030f592
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10632 bytes
SHA-256: 5f90bb39746cf6c9010fc4bf87d65ed55315ce074bf03693eef98c735e3eb68e

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