Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27dd433dc80a0d3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 15:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af5bb82cf107255165255d7c1d419d71 SHA-1: 9c37e751ed7e820240285de44126db50b191fac1 SHA-256: d27dd433dc80a0d3b9ad66678e5a0d323e7344a79e4b4a0e817b0db5f47b0c16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to other PDF files, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trufeel.com/ckeditor/ckfinder/uploadfile/files/26733429735.pdf In PDF document text
    • http://zlhk.ru/upload_picture/file/xegewaroxezemuf.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/28419571432.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/65904969028.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/piwanunudilerukavidure.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/fumamatukuvezizabisu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/gojatukajawasaraxu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/refinovinigikarulof.pdfIn PDF document text
    • http://vswet.ru/f/xapelidebigizevoko.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/17409902139.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/nutoso.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/volamafojotarupat.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/38422740893.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/golifapivor.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/rewosi.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/50487315020.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/vulejar.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/561204822.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/45399029977.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309b671c7fc---gopumexisu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/bedudejujisoxeterorabo.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/18622243831.pdfIn PDF document text
    • http://acril.ru/ufiles/files/56469246188.pdfIn PDF document text
    • http://linker-apps.com/files/zasukabavaram.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/71545812242.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/gafukejuritusofaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fifa+14+ultimate+team+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_off0000c9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 18468 bytes
SHA-256: 5fbb5091567526298e1a96f6bf938076dae6d56be4d6d1109bbd6e63b0e4dd7e
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 10324 bytes
SHA-256: 43434d70a85eb5009f2091cb1f4fd8c2925d497bfc22843c562c737db43b7de7

Open this report in the interactive analyzer, or submit your own file for analysis.