Malicious PDF — malware analysis report

Static analysis result for SHA-256 929dd1d2c25a39c8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 20:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9aa0fffacc5d6791c60e7b08e6a68dc SHA-1: 80badff3abc8f35531f9266b8d0176a6dd7cb493 SHA-256: 929dd1d2c25a39c877d64fb6a2d88bd6d9e90093953fe7894d31c366bca5b0ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to external link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://youngshiny.com/userfiles/file/1630575935.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/26911371824.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lutesufobisemipiviroxixu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fe69bc3e---79613627488.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wofesololido.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/90989011169.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/lamibapuvuruxinoko.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca0fbba0c---tarodawabuzanaduli.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/29374588025.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/32061046009.pdfIn PDF document text
    • https://zzwgjx.com/d/files/36212888016.pdfIn PDF document text
    • https://nevisnews.com/userfiles/mutofonotib.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/52869587001.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109061119167482.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/nuxowalut.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nafaja.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/nosenusofet.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/98127245370.pdfIn PDF document text
    • http://secoinblock.com/upload/files/wuzaxisibekamu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68180546085.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109010531066965.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/28895330733.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/voxijagedopijewo.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tajawuzivirero.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/logavenovuvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=justin+tv+para+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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 19404 bytes
SHA-256: 42566e62abc64df2099b567ced8cc43dea7a96febdd6f5b89c5602e64196ed39
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 10364 bytes
SHA-256: 1384e700e26df69c74715daee2537cb65b8cc16aa67599cab9ef12353e43fde1

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