Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2acd32b4ec02a4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 22:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff7a867676588f3194858260dd50fe5b SHA-1: a3b738c74805de8e1ae6e042d9e43d8e21511216 SHA-256: da2acd32b4ec02a4e8af615d5f820e87b4d77be5c9dacad101214496be078b22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.funes.gob.ar/ckfinder/userfiles/files/28522528415.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143de81ae038---fiwudafu.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/todesapuwewekepit.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vufazexudafomurese.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/51423057327.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/jixobunabosifat.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/50876199187.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/wekuzozij.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb6be618f---wugagoxodufapa.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/49431410867.pdfIn PDF document text
    • http://redactron.com/userfiles/file/mopuxutuwumef.pdfIn PDF document text
    • http://rotang.net/userfiles/file/lawerusutitibal.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/60088929214.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4aa941cd---rodolimap.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911201409.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wepiwepem.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/13198669565.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/moduxibumolewusujaxivep.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/zirezigiburawisug.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/vozapu.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/katerebekafavuliserug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=https+apkdone+com+turbo+vpn+downloadPDF 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 11060 bytes
SHA-256: 28c0090cfe016134af2075dd34ac3d27c66416536a66280468ba8b3158e04082
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 19484 bytes
SHA-256: f1fe29b86e1256f30da066cd34b176bc1e5c63372eeae467457504b445ed9e51

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