Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bcebd3123eb9a3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-28 13:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9c122f1d5b32e4d62a1da4f8595dad6 SHA-1: aa3f1ceca81e979632500b6ad842b2fc3ab2d02d SHA-256: 04bcebd3123eb9a3d2e1fa8f15eaee68277ca67ab24be390be3cb2fddd2200f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. 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 embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ikomsolutions.com/admin/userfiles/file/2016518461.pdf In PDF document text
    • http://olympicburger1988.com/uploads/files/88141952235.pdfIn PDF document text
    • http://smogy.ru/files/files/65968437769.pdfIn PDF document text
    • https://teamcode.net/upload/files/32131549690.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/nexikesuvejifa.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5681e4817---36684186947.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/744071450.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/21632638897.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/db2e4e8b9add91799286bf64feb77e2f/senodawejurazegapaloxaj.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/81984184837.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/82222773653.pdfIn PDF document text
    • http://caramelitos.sk/files/4507299457.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/48602204538.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/60624193489.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/46739538078.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jupilox.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/9529057007.pdfIn PDF document text
    • https://cartolmania.it/file/64618068459.pdfIn PDF document text
    • http://eternoohydro.com/d/files/40422308096.pdfIn PDF document text
    • http://espwireless.net/uploads/file/sejonezuvojivawifejun.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/wibopiratupijakux.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/vokogizukegagisosafuteje.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/17099899299.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/wekanekumozuzezewugotev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=miui+12+screen+mirroringPDF 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_off0000ba28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 10532 bytes
SHA-256: fb278910c0707d70aa63309b79eb7035cefd1ea8ea5150eaf0b715c8098d903c
font_01_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 18928 bytes
SHA-256: 5e0f6619333666a6a0dfa056a1b74db06a97b57f007f0a0d34f7ad8880c3f2c9
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1