Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e77de5f447eec4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 19:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63423172d83fede8e90369f8b90329eb SHA-1: d612e1b530f27bcaf3f1c2692a1116b0687b823d SHA-256: 70e77de5f447eec405c8da724996343d68c5f795f515bf963cb47453b84d6fad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=moto+g3+stock+rom PDF link annotation
    • http://msdoubrava.cz/foto/images/file/80637858911.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///puxonekodefokamivezomo.pdfIn PDF document text
    • https://123natura.com/stockages/files/dotaf.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/48877011132.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/duzejegedutatapokud.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/rolizufobok.pdfIn PDF document text
    • http://change4best.ru/upload/file/47293815442.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/46802213251.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/nazezudanijumujir.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df05f15e---97926554682.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/40856458072.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mutibemaza.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/3889983993.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/gamapexujebefuvaxaf.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/vusulanuburazibapapam.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/94868904131.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/26313734002.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/pigar.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/51855660352.pdfIn PDF document text
    • https://eslms.com/userfiles/file/34871631809.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/4725030037.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/98573119727.pdfIn PDF document text
    • https://mavibusiness.it/file/71065173818.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vebubivopigetuwokuzer.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59cb429e0---90981277341.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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 17352 bytes
SHA-256: 927aae433c2dcc10fda281d108c399d51d7900ba8a440176246bacf046662b38
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 10296 bytes
SHA-256: d1a5675090421e7f17bf0a7e3cdc0246784e2063964fe832a2f33e55d5019f53
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1