Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5f1dc588603a8f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 22:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5fc083dc3f2031348454e5f2a72e4a3 SHA-1: 45e304255d66fa1e01e5aa9eebbc0d51df005206 SHA-256: ba5f1dc588603a8f1ec13cb87c6e1abf439d7a37ace8880c4b5d17e25487cc07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, including embedded links and a detected download button. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into downloading further malicious content, likely through a chain of redirects or direct downloads from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lednotice.com/userData/board/file/22916821103.pdf In PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/18924649720.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jakugixujuvefuxujizuzav.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/62678613169.pdfIn PDF document text
    • https://geniodelweb.com/file/5490326801.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///kubijivaluga.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/fafegufexolufomemogowa.pdfIn PDF document text
    • https://iword.de/userfiles/file/827621153.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903081937651.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/wexapidowimusixuloxovirux.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/nubipu.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/4156242091.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/14188984811.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/34253974490.pdfIn PDF document text
    • http://reichspfarrer.sk/file/buxovimolulav.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/65579954096.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/mizulafepukigunexesuv.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/42314946917.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/14687840495.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zeripepulebukipudutokem.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb5075cf3---digalojejinafo.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/51144191408.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/soverikedajuzotamizegewa.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/towaxavevejajowumirubabor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=old+movie+download+websitePDF 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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10628 bytes
SHA-256: b63f76d3837548aaf89c7101b802e90e88f8db489c26c9ff1443ac23edf7ea65
font_02_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 17120 bytes
SHA-256: 4701923821cbf1df2db55ee61b7ef992e296b22cbde0bd3ec5c4b2f283e0bc3b