Malicious PDF — malware analysis report

Static analysis result for SHA-256 242484305e3859b0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 01:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57b7c7b39fe588788547d9cef410ab68 SHA-1: 8285a356958fdbfa32bc57aecc5ce1836a35f502 SHA-256: 242484305e3859b00d0a11f191297a2edd0699bd1f8bdcf5bf01460bc17bd787
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://dukra.sk/editor_uploads/files/49472543055.pdf In PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/gegese.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/46295809436.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94706996517.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jutugadiwaveneg.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/dojapuwisofezuki.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/watuzaku.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/toworuduvufadeluvomababin.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/zawisikimonobix.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/55221036790.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gimawajovavumijonuwime.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/36118188382.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_121640.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/gojikuvikilixaxi.pdfIn PDF document text
    • https://qnzar.com/files/medovupubixiberusosuwige.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/ranalefabinedakevulubaw.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/2533701743.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/verivazomolobokili.pdfIn PDF document text
    • http://tion.hu/upload/file/61402681457.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/17273376832.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/23229404119.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/gugupebavagelefafubowilit.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137463e8534d---21228437878.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/rexutudawonofesal.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lujizavapos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=my+hero+academia+season+4+english+dub+freePDF 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_off0000bb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 11248 bytes
SHA-256: 50ae7e70166c2437ac4374d21ed1470ce33d054a0183241d6afac9df0a6b2c9f
font_01_sfnt_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 19552 bytes
SHA-256: 4a06efc3508cea763040fabc3872ebd7c2970997c1d2d4c5ca497836f404095c
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1