Malicious PDF — malware analysis report

Static analysis result for SHA-256 7500e39fcd30e56d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 12:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27e5621f83a8ba7ebb33a9017b74dffa SHA-1: 1b3d58de0398777ff08f5577f64146907d54002c SHA-256: 7500e39fcd30e56d5a3046508821997cc1acfaba1f626f51019981a832315b2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs, while many are benign, point to a pattern of hosting numerous PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://disonde.com/filespath/files/20210904142740.pdf In PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/biboposol.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pixiforovobato.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/38510175408.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/fazomimelolegapewobedos.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/56734282300.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/77675530770.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/goxogikenixanoniredunajov.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/23913767056.pdfIn PDF document text
    • https://flomogroup.com/upload/files/zozusikazazamanawadapizon.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/98736199509.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mixuvamuvakowi.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/57423501650.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/61321128904.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704361173499.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/16963959914.pdfIn PDF document text
    • https://kawanmto.org/contents/files/91210759879.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1abcaccc---tetegituvirezosi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/58976311957.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/42223385535.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/68586627217.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizirobemu.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/46930479092.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/93770091180.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ec048c382276b794c8c3b4f2b87cb0d6/bowowunederapopirumuk.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/wikimenixaziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+hide+app+folders+on+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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 17348 bytes
SHA-256: 595c822f1f43ff525ab6510834c032e7a6b3656311f8a2551946b93440fa2345
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 10672 bytes
SHA-256: 8cbfe64c259d06fd45562cfef9d7ed84d5e4eaae12bdfbb034e87ed7cd4d8fe6