Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8934e5f74a859b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 03:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 226ef0b674b36f3a42e722ff9351b96d SHA-1: 4bed50b380e79596d7a432c91608636f8abf1e52 SHA-256: 2b8934e5f74a859bee8d20dee886e74bffe7bf25dfd0c1962ab92d375861a76f
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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://tsydesign.com/userfiles/jws/files/pupuziwusi.pdf In PDF document text
    • https://sarvodayasamaj.uk/upload/files/zefebim.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/jikerax.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/5958350275.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/loxegimirix.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/3664777024.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c4b4f697c8b997dc68e0c24d5194f7bc/36162036275.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060107158612.pdfIn PDF document text
    • https://jss-moms.si/upload/File/2971559099.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/76733690538.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/botavaxetetigonuva.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/vadilegetuwipura.pdfIn PDF document text
    • https://lapakunited.com/contents/files/pipinitilanebipafolulenip.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/81196633714.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/natugipekedojapoji.pdfIn PDF document text
    • http://aweibel.com/Photo/file/91812276725.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/punugogive.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jozusarame.pdfIn PDF document text
    • https://vientangluc.com/upload/files/36633315228.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/87090025289.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/rinazazigil.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/7164653886.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/kirovasezipenosutonon.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/55486777453.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/51323824227.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/paseki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ships+of+battle+age+of+pirates+mod+apkPDF 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_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 16560 bytes
SHA-256: e1298ab7d9fd789173ad145697e1ebe260fd1c20095d841edc1c72b93e06f525
font_01_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 11148 bytes
SHA-256: bf4cbabc01bb677b0b618bc748ce947634a27012ebcfdcb66bab67f3ff1f712f