Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5b553f070bf683…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 07:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4bc314b6dbf4eec13db2d73d7279760 SHA-1: a7eba8891a4e7bc49c70e557d2f09bdac564b8f0 SHA-256: 1a5b553f070bf68381f58b93dd638af4ee7740331200a9f35c5d28e824d9c9ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of many distinct hosts and links, suggesting a coordinated effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tulazelube.pdf In PDF document text
    • https://artedelvalle.cl/gal/files/file/lujuzobalosi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92c25a7fa---norojixujexonadiw.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/66201651673.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/67117245550.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/36562944474.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40846228008.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/domox.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/47764680035.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/87814222449.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/28375051877.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210917214721.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/66375763359.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/terexevewamujezuxidoboxar.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/saxofotorixesosarilad.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/8554945619.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/xiborapija.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/31367407879.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/17762586096.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/ruvunogojefesavaf.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/sudebowew.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/povulimusepukopob.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/20652080888.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/sowofikafagiro.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/94683433277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=smart+iptv+player+mod+apkPDF 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_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16932 bytes
SHA-256: 3e6e30be3933539b8a5c183a4babc33266d36570bbd5a39e03d58fe711f02d48
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10628 bytes
SHA-256: 7db46bdab2532bf5787ca7fc5b82cfe1b6a9e57e346cc3dbfeac49d698b8c6d4