Malicious PDF — malware analysis report

Static analysis result for SHA-256 db457e0a2d233a69…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 17:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40f089eec36cda6d671500198368910f SHA-1: a1f6ed7c13fddce394e339d3961249593b297e6c SHA-256: db457e0a2d233a696913e2a4d473ad9a0e2647750702e78b547e1593cf9b241b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=best+android+video+editor+2021 PDF link annotation
    • https://majubesar.info/contents/files/jupuvigamubuwurapi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zutumilu.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/69485884864.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xupowupufujuxunarebu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/73583506363.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/46563896779.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/ruxosuzumujug.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090817262373499.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/katoratitonexijakuj.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/wivokosolaverululupu.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/jirezigek.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/magulowuwalovovakedafudob.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109012106529087.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/58695118776.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337e86ef70d---nufazesuwemomamosesexegov.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/98136585480.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rakaboxewazafaredunav.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/vemikidejikuvelilekapa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ad3du9qttho3u6er5e36i3vql5/75262257806.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/21224015020.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090915174080554.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/75358427686.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/90139825327.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/faviwetixosifowedifabo.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/5998765634.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/madoke.pdfIn PDF document text
    • 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10608 bytes
SHA-256: 9673bfaec35d9dcfa0cb2a4289a074b4ca7eaecc13bf8ba46d94815baf490a6d
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17796 bytes
SHA-256: bfb4d3493fade0616030af6e297312bbdc4111c2497e8697279e2549332c9866
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1