Malicious PDF — malware analysis report

Static analysis result for SHA-256 0828d8988ea84c41…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 12:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a1392915bdf20b3bb8fe0da9ea46c5a SHA-1: 18ae2dbdc7b1245381385dfec45a129b4d1efa8f SHA-256: 0828d8988ea84c413ca4d3242c1824e6e9d7db562b44ca8cbae0619d9c0a293b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The document contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the ultimate malicious destination. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://huucodatlanh.com/userfiles/file/96381926787.pdf In PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jilixofezo.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/96929161355.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04ad6ac03---12502847535.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/20968167180.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/gawikinomerosozimugar.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xofibefenudusutafajel.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/vuvavagir.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/rufekirubozepubevixoxa.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/zejever.pdfIn PDF document text
    • https://eclearusa.com/images/file/vitoxewes.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/10976729195.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/31782942552.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/38947831693.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/20928961701.pdfIn PDF document text
    • http://retailjewellerindiaawards.com/userfiles/file/xujetepedoleziga.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/46553336060.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/10068763395.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/xuvipojevibimox.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314c878ee6---puzotozadexoni.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/butadivuwapiroro.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/93963267858.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/39882748184.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/77863883528.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/terekijo.pdfIn PDF document text
    • http://e-district.org/userfiles/file/66782824011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kmplayer+apk+download+for+pcPDF 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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 10704 bytes
SHA-256: f634e6b35bec6ba5e84eb90e9f3914f0bc25198df72092a2826290e190b2380c
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 14596 bytes
SHA-256: e28c12f1b6a6b15dbd8e4b3527d85b1ac81e8bc60a68d06a85b45b6f2478b80e