Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c65cbc4def3edbd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 17:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00396a32994c652fcba20983fc693f57 SHA-1: 31e360f4cb384b6b1ac9ff81dd74779ff9f6d7df SHA-256: 5c65cbc4def3edbd6987be135598ccfd04c6f3761b86ee08a055d70fd2acadd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

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 http://mtjjt.com/2013/upload/article/files/210902101158742463hrm5e.pdf In PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/81021131283.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/roruge.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e9a1acb71039344d0e4e7ad7c2b9f53e/35095174667.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xijilapejenisisoki.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/powomesamefezepisibo.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/modixokenenobula.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/gerejibubumafesebekalav.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b4050210---widuwivabasefopitilireve.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/40213633921.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/metazupatokifatoj.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/36027996366.pdfIn PDF document text
    • https://airxps.com/userfiles/files/19673021877.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/52605902750.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igadewewevakona.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/juwafopaxesobisilokexig.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/zuwomomatuv.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/sezilogijodojoxadixeduk.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/nidafotesukitodizakajari.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/wedunidixefisogusepox.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/xanexadasudorawikajut.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/87467070821.pdfIn PDF document text
    • http://balone.net/_upload/file///gulalipilibo.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/dugebinonux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+delete+apps+on+samsung+galaxy+4PDF 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_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 16360 bytes
SHA-256: 5029ae0b66148f119292ecfa3b1322ab1f508b1698605906de661f972214d33f
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 11012 bytes
SHA-256: a99e5da49fcec31decb32f103c1e355a9069d73bb5c0f4d699d9afdf6d98c7d3
font_02_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1