Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ba59959ae498d…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 12:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 23c0de3f193bd65d187e7dd2a4cfd6ea SHA-1: 486828be22dac3b436af00bf78e52905e218a46f SHA-256: e35ba59959ae498d0e7ae8d0ea0c712dea074d3261dd9e716d96929d883d52f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the redirection to external URLs.

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 https://huntic.ru/uplcv?utm_term=lawyers+manual+on+domestic+violence PDF link annotation
    • https://virker-ikke.dk/files/dezerevomemubapazuvimo.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/gumukufa.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/90584653769.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/73385037595.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/22492098086.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/sefepozajusotedovi.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/numexapokipagav.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/pamibunuwaxojazo.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/41151907362.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/73372566127.pdfIn PDF document text
    • http://kaies.cn/upfiles/21091213512927441300g43a.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/16749161454.pdfIn PDF document text
    • http://rentaruedas.com/files/others/motasonepujizivitam.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/87210872917.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613db484de8cd---biwisitabamukosutafogine.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f5eb0a82f---99568021264.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/xizadekogugopazazu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/bafemozokomel.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/81351394544.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/zifivelojonilusenafakuk.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/77615262096.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/wirebaduduxipenimube.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/20325434593.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/bezetinozimirokunanetogi.pdfIn PDF document text
    • 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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 10852 bytes
SHA-256: 9409e1aabb529179cf05e06c6a2c4308cab647d47995e99d301673d63b856485
font_02_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 17700 bytes
SHA-256: b02213a7d967513b7357d53c78a8b6d47a15647b28c944e28e598663292d2c0b