Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b684b70f72d72…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 00:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 225287b6114bfcf2f6dddda12efaa189 SHA-1: 27da5ca262742efa3b00536c99a858f492bc586f SHA-256: bd4b684b70f72d728e2f1ddb6d204c8850a389e8cf85c3f00569bb2bea0921de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many of which are hosted on disposable domains, indicating a link farm designed to deceive users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://udmvdpo.ru/images/files/bisalazas.pdf In PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sofemi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8ff42b62d85cd4ae0f21501eda7641e6/71086894482.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fovebokogilufupaponesula.pdfIn PDF document text
    • http://gardatrans.com/content/Files/47830584902.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf2babcc18---53360990575.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/jodoxuralirote.pdfIn PDF document text
    • http://vhktn.at/images/content/files/8222908330.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/21266038196.pdfIn PDF document text
    • http://viettruss.com/upload/file/77310545784.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gamegokunik.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/53694342725.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/36441000511.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/92510891495.pdfIn PDF document text
    • https://angem.fr/userfiles/file/dosizadugamiwi.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/damozavexavisedam.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/bubizelemusij.pdfIn PDF document text
    • http://venkateshservices.com/uploads/labit.pdfIn PDF document text
    • https://chptravel.ir/data/file/27914189717.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/telosimuzok.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/fonabemagiferani.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/33538841669.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/81669341411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=game+download+sites+for+androidPDF 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10640 bytes
SHA-256: e56aeeb8da7f75a7516e08d83aa8711dfda94dd811bf4731823851bd8320ccdd
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 17688 bytes
SHA-256: bb7fe76d8a7dac182e8efb2bd36a5b91ce4d3c295b65c7a12aa6e98a232a8cb5
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1