Malicious PDF — malware analysis report

Static analysis result for SHA-256 41743975dffc0f41…

MALICIOUS

PDF

75.5 KB Created: 2021-10-05 13:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 233b4300e8c8a2d97ebf2f49556f0a96 SHA-1: a53dba61d31625eb71b93c64fe4809e7718453a4 SHA-256: 41743975dffc0f41652990a340b4c860ec0cc7a80d7e74c3f4420875b697859b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://rainhouse.kr/data/editor/file/2245696416145637e0c3bd.pdf In PDF document text
    • http://come2menorca.com/images/file/7365644447.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/69464934629.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141538ea659d---28842394499.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/46874305688.pdfIn PDF document text
    • https://basisnomor.com/contents/files/kuwamezinujuri.pdfIn PDF document text
    • http://thedreams.cz/files/98943090030.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/wijuwisisove.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/9300955980.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/jakezumaladusiduxel.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dupovibuv.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/65188871150.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/xobokara.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/degaga.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gurisekotuje.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fiwimuxoxifepan.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/sukesibigu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/27549178407.pdfIn PDF document text
    • https://ms02bet.com/contents/files/fawedekur.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/fuxukakiwovuvelori.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89065455372.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/33854691785.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gemowimowon.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/cb916e04e233ed1e7cfdadb9edc1bbb5/fidejopanonapufawujuv.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mosizenezupoligamekino.pdfIn PDF document text
    • http://esistore.be/userfiles/file/5027979399.pdfIn PDF document text
    • https://allianztc.ro/files/file/gidiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=law+of+definite+proportions+worksheetPDF 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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 10684 bytes
SHA-256: 133d319e3ea242634f81952b1b50b5c4453847f180eff156e6dc1cbd06e58ad1
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 16904 bytes
SHA-256: 3b0189cb405a77af459daa6521df993a9aad8937f800485c72cc3422a4884fd1