Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea92a7759c13761…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 05:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69396a8b7ff8e58140b14ed34005e236 SHA-1: d54e1d1f86bdfc5d9d14563873fc5f21e205acd2 SHA-256: 4ea92a7759c13761a49baaa71d8341bc34edf4ceda04e18f69096e0c102c04c3
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, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a tactic to obscure malicious destinations or distribute malware. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://marosme.ro/hirek/file/82457630877.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/33317811662.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/finidomebegifomemew.pdfIn PDF document text
    • http://altus.pl/userfiles/file/34403088773.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210905103338.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/patedowibod.pdfIn PDF document text
    • https://polytex.de/sites/default/files/38086037439.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/73826114803.pdfIn PDF document text
    • http://rld-carbon.ru/file/vuvegofojalurekepumefom.pdfIn PDF document text
    • https://brod-plovdiv.com/images/kelotapepuwufukevod.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/41572213386.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dajopir.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/37337739296.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/49633692139.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jebulekoduwilaroduvil.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/lixegaxavutidixaz.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/2156723001.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/74054829473.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/veteki.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pokijetujibaso.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/34677545797.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xadasiri.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea206aa91f---tawij.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/95782099064.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/41819026099.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/96896589727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=find+router+ip+on+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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10248 bytes
SHA-256: 5695daf6fbac84a16a8fa55a140d43427af88cadc511f614f33277d3ec8f62ee
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 17588 bytes
SHA-256: f6a072da25ea7ee45deb3dbb91378def2b63e9e1f92ae5afca08e19d91514bf3