Malicious PDF — malware analysis report

Static analysis result for SHA-256 23666e2de2f2d096…

MALICIOUS

PDF

71.3 KB Created: 2021-10-05 22:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f48e4d2efceeddcb6c78bbb0de8efe4f SHA-1: e3cfa78eddf8a4f93bf4db204d95328a871611ca SHA-256: 23666e2de2f2d0969a3c1ae916ca98ee130d6148a6083c97b34ec41674748a35
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF also functions as a link farm, hosting numerous links to disposable domains, further indicating a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://adepotcustom.com/UploadFiles/file/20210917155022124.pdf In PDF document text
    • http://novena99.com/uploads/files/202109140617283445.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/99250963940.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/7526332956.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zipimovuzituwilufabod.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45471731327.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/nuwizumimevoleriwoveb.pdfIn PDF document text
    • https://petek.biz/resimler/files/direlo.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/30312354040.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/5243685691.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tegugurex.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/medegesedewat.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/gudigudun.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lofasu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/16195986171.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/74394970074.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jatejutedaferuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453ebbca928---furofidazelijat.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/59950947809.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/vujomef.pdfIn PDF document text
    • https://go2germany.ru/files/file/puvotarizosirusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=side+launcher+android+tvPDF 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_off0000b4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 10540 bytes
SHA-256: ab019d7ae210ff7f5c2767a1799b2ab4a78963483c968befb7ddd9cd6df62feb
font_01_sfnt_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 16572 bytes
SHA-256: 791c25a59ae5959e1aed0980c20d09803a25f5c2b5e678c304a8bfde30ab2c1a
font_02_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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