Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed899a93a152e89…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 10:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a2ab792e483063c3d32aca450e9e534 SHA-1: 944a2daafd9c6870ec7b1148a79e6f8252b5cd6c SHA-256: 1ed899a93a152e89b5671ef4943caea1f9b9dbcc28e1be8700af826cb56c6c39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a potential for JavaScript execution or exploitation to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ros-grad.ru/fck_editor_files/files/gapumamolij.pdf In PDF document text
    • https://silverbirdmarketing.com/pages/images/file/75103846916.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/kegisesiwigu.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/jevegoresinujefa.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bafufozigekixusikonanomos.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/merowatamenakan.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fanedosodisi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121846446182.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zazuxemaromujokom.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fa810753.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/32990028630.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/zozikibevuf.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/makebakujazada.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/golozokit.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/batujen.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rebewoxunafanuloki.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tl5n9s83suhe4g1tnrfg17gc3s/zudiwuzar.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/nufufo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/delojixapuxipe.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/simiwajuvubeporakegubux.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/56270289704.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/7233618784.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/75925305724.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/veroxaforefin.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/93185083150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=star+wars+ataru+formPDF 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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 10264 bytes
SHA-256: 855a00c43dea0be6424de07af4f384df90724fe2bd43cb50bfeffb3850734c36
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 18432 bytes
SHA-256: 0142c089bc855f0ff10b46378ed303e964810780cb9428fe202209de987d78a4

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