Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5708c88b35508…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 22:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3187cc7ed7c05b09b8b33d14bb32cf39 SHA-1: 8f3e91e4b4ba6bcf025767d1d503cf1c3c6daa8b SHA-256: 20d5708c88b355087c4b9d20a5731fa5443a1165eb609c17a9437732a82fc2c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised websites hosting PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a malicious intent to distribute content via numerous small, disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://galerie45.com/userfiles/file/tixesazeduwipuberusotul.pdf In PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/73318460333.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/60693372121.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/nusikuxonuxunadeleb.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/novaxuguf.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/68971776655.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xupuwosilozapidolu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/pogegusitotutodaru.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i25hu0endlf9kujne0f9qbg9j0/20498319276.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/16988269815.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/fokudege.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/1395213546.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/bafukerojidulinej.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gupumanakekezaxuji.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/46755476666.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/ruzavusul.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/96352757910.pdfIn PDF document text
    • http://fitviewer.info/files/file/83700936767.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/60759279510.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/28101714739.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mipizolamoduw.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109120950571900.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/faae44ce9ab178ae1c10530a3a713459/gupazitavosinamuwi.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/49057554527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apowermirror+screen+mirroringPDF 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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 15328 bytes
SHA-256: 144098ecda8fad697ca54a0fe18c8ce386e60358f5cc49cac73b2840eb7cc5d1
font_02_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10480 bytes
SHA-256: 3384069fb98d3f564014f0f257e554e20b187daf99baf11024ffdd242a9dd483