Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a87878f6df1861…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 15:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c45efca0d27f2fe4a3a9c3d04b1c981b SHA-1: f68e6551a0d33afcd55714a2764e362c904c87b0 SHA-256: c1a87878f6df1861009da04fce24a713f7e7c37453df7624bc53b271321aa620
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://balogmihaly.hu/UserFiles/file/wukazuvanenidanugop.pdf In PDF document text
    • https://eko-briketes.lv/userfiles/files/43988866250.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/55059930018.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kuludopazuxitemuved.pdfIn PDF document text
    • https://aaaxxion.info/images/file/39169113567.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/xadimuxanejoxu.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/29242352403.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/getekifuliworanuzaf.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/zoparevatuxiko.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/legudevosedewagab.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/xubokabelafebaz.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/forevuv.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kotipawewaguxulaxojejuxon.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613497de1dbf1---taruj.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/41374395227.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/93176791502.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kelekamifewozirujiva.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/zajulelujegosegofagopemax.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135eee33cd2a---34378325288.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/64419500039.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wojudududozix.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/baxupujag.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/wazepod.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/41068351944.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/lofijinisab.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/3817339494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mil+veces+hasta+siempre+john+green+pdfPDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 11256 bytes
SHA-256: e44a4c5108739e237bf53d6d81a1821ad997cae862f67c01034dcd0384875ba6
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 20176 bytes
SHA-256: 7fb57d8ae392d39186b2b5ebdc0aebc39d2675e236d15ad2e50e5fe318a15573
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1