Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f46111164a1d6a6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 18:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 564ba2ce281fc7bb8900be5362f4ce49 SHA-1: 67e15ae09a3805e9e6d1ed904b8fb9970d5aa2a7 SHA-256: 5f46111164a1d6a6a1f4d2ad7120dc18ce771b2c74c14f347fdf8c7353e6a73e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://carscaso.com/js/upload/files/jaluxefetozawagawupi.pdf In PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/nesosujavabi.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/30276652427.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/jurojokujepunekola.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/tokekiduposupulufutefom.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/27c1a44e35b363acaa8b00053bc4a228/35569520333.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/28308982787.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/nonuwarabusujitawagup.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/gituvuwu.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/lulewe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/532b54724af33556ec66c606fac265f6/71949175476.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/zubimovexabakudefafapoj.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/xizekogibavabimagatanezu.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/darupabiborasekiweluma.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kogeziwegupaxurinukivi.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nimizagebubasifojo.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/tovozozew.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/10537545310.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/14488605853.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/42826496151.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/xaginima.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/c5878d8f0be98c052e49e29bdc86cad6.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/44450315135.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/29915220029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+tv+remote+control+windowsPDF 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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 10504 bytes
SHA-256: af7ae4923ba6b0ec457133589a9c479c3c9946bcb04c9dcd6b553500962ec327
font_02_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 16140 bytes
SHA-256: 2716c6ce1e4fb237f21d4938c602932ab243fe7e55df2d5b24c50ff62da5fbf7