Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9045308e57724e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 07:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35a87a5f78130dae401980705fff871e SHA-1: d5c24aa7f40722feed55b1b6c2e5aa2a56237585 SHA-256: de9045308e57724e5ffa57455f826952abb5257aef9235275502e104f3c032c1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://phongkhamthienhoa.org/images/files/mezawixobitanotodiri.pdf In PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/daleg.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/44795301632.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/romovuberowikarowij.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/ridufabotodokos.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kupavewudamibakesezox.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gixenifakalexexesuxagiw.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/15242087831.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/wogugixidokupoderimuraxa.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffb27f8bc---81783472323.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/jaburijogemigijiwukupopi.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/81404762427.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/16555867524.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/24339664015.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/27250487215.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/vamivom.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/51324567553.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/45683675777.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/jevigubuvadusewiwupigidu.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/walezojaraped.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/xaguson.pdfIn PDF document text
    • http://stefani.cz/fck/file/55197521286.pdfIn PDF document text
    • http://polipack.ru/content/file/posel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=configuracion+de+correo+pop3+en+androidPDF 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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10788 bytes
SHA-256: be961fa3fac37dfca6016fb1cd7f496bdfbe38422989db24ce10df8e80f55b68
font_02_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 18984 bytes
SHA-256: e089940be6ea727f5ae938b14f89c5ad1d743c9840eba7345e9403621f310fba

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