Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8a195dbe1324d2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 23:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbf31902aa4c52d8cd7a2f322671bd3f SHA-1: f3d8223e2b5cb3702bff272dc20d7d852140e297 SHA-256: 2e8a195dbe1324d21b1263c1b7d9e5dcb7bd97d010aad91caca57a60e81cf381
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hangnhatbanonline.com/upload/files/finewobekoxujapuku.pdf In PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/zutuwamuselevopedum.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/mowadaboxewaweremuwidinir.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/55ee2a7520b2807ca155839427bbbd33/31411784091.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/68863031565.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/56934565748.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/4652078075.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/85583034156.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/9361559115.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pazifazozota.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/91036231584.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df3974a979---57691363152.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/lerumojos.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wunuvotutizarexuxexujimat.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/nunivamur.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/zepalowawuwujomusi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/mediga.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/73311726975.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/61228635286.pdfIn PDF document text
    • http://dsraxys.com/uploads/69113430373.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908010203.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/davakifereses.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vagakur.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/goxodalaromu.pdfIn PDF document text
    • http://entrackintl.com/uploads/sibexogarakidup.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/pevevurezexuvasodigizok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=online+pdf+crop+toolPDF 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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17840 bytes
SHA-256: 3a592bd0027842b85a786b6b9595f98c5df39e1fd845dfe2742646c5e8c206ff
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 10308 bytes
SHA-256: ee11af50bfdd5f998aa596fedcaf8bdf4296cbe29ce58a32cff4e63752de4543
font_02_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1