Malicious PDF — malware analysis report

Static analysis result for SHA-256 498ca52a6a25932b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 00:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 231f3ed1149c7fb59741a6c81d0fa5a7 SHA-1: 629895b481b0f72cb49d369d554dc04c810225a7 SHA-256: 498ca52a6a25932b34c3d6ea427031c99e04d8c95b911b9b31e1dc51917bff25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. The high number of external URIs, many pointing to suspicious domains, suggests a phishing or malware distribution campaign. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://life-worldwide.org/assets/uploads/files/gadagoniz.pdf In PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wosatemufu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/zesafosagaxafedutel.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/60697001579.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xubijexiwev.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/68752628638.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/kufaj.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/rubinal.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gixavifatewarolinepefa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133144b6546d---39456805887.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/lojomuwitunesapuxisivim.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/rilebarelusonat.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/50260702288.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/28159891640.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/xusulaserod.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gexifisetezobeto.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47512694429.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • http://remobudostol.pl/pliki/24618634648.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/75259341822.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/38770801260.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/99273446481.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/32268418776.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/16096299802.pdfIn PDF document text
    • http://charontrade.hu/data/file/48585493117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gordon+marjory+theoryPDF 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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10492 bytes
SHA-256: bd3847e3897b06d560a80dee0471d1a9e123d02ff9bf0e1dd19937a74add35ee
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 18768 bytes
SHA-256: b6842cf604380b85aad2824904ca0082267e9e94ddc6b9b4485edcf1b01dcc56