Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2bac012cdc2285…

MALICIOUS

PDF

73.2 KB Created: 2021-10-01 09:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f3df667cfc6b3e2793ab92a4e0a62c3 SHA-1: aba743ce47e903e0af77ee1a101e7d87c89794b5 SHA-256: bc2bac012cdc2285a5a40b43b426c369fc8d5c9c2be0f0e0c20bf0e268e9492d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The PDF structure and embedded content suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://infrive.ru/uplcv?utm_term=how+to+change+background+in+powerpoint+android PDF link annotation
    • https://vantainoidia.vn/ci/userfiles/files/rexesid.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/vizev.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/64425239660.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/61917126146.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/makamojugibixufewupez.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/jobiguwoxifure.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vesetojekawa.pdfIn PDF document text
    • https://felicityokolo.com/file/37627599878.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/dajojorevedobagalesi.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/sojipagum.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/26283526456.pdfIn PDF document text
    • https://socardan.com/userfiles/files/62860876762.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/ruvunadutegipumumisuker.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/161564c9a5b720---28979552902.pdfIn PDF document text
    • http://centronegozi.com/public/nozevekizapesog.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/nuxaturoroputazum.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/71825525999.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f2b523bc---ditofipulugulopo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/warugikivuninif.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/dutesa.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/pipuxadefitamiguveminuji.pdfIn PDF document text
    • https://rrhh.fronteraliving.com/imagenes/contenidos/files/59850295606.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/73750051668.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/1898099037.pdfIn PDF document text
    • 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 10988 bytes
SHA-256: 4a7fa0c89ececa7aaf71c605d45418d86a43dc0d4b8fbfd39a6705fe7a2923d6
font_02_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 18480 bytes
SHA-256: f63f0f6d3cfbfc98a6ee3cfad7da5ce37aa9b0a6c9a4a7b048a3c5a2560d0abe