Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd81ed15b940881…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 22:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 242a97d36f5d5734209608afb33288c4 SHA-1: 46805e201923f340a9dce5740139b803de697221 SHA-256: 5dd81ed15b940881969ca2f24530633886b952bfd1bfa41cf076e1fba75ee925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, with a high concentration of external URIs. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8r7jdm9jsjb881q3r97s5qo6k7/16976964005.pdf In PDF document text
    • https://chptravel.ir/data/file/zamibetavenunukojowi.pdfIn PDF document text
    • http://gekon.net/userfiles/file/54670367461.pdfIn PDF document text
    • https://ms2oke.com/contents/files/bujovufigoxon.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fedosagamedowutusexukixi.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/28997939095.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1dc428a---41676196303.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/xovutoxakufamebaxizor.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/samiridovufopatujizomu.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/wasabufegivo.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/tizasiwagakamoxixofoxiw.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/3507942056134ed8dc14d4.pdfIn PDF document text
    • http://hzqzg.com/d/files/37821966115.pdfIn PDF document text
    • https://maturana.cl/upload/file/manedisazaf.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090719273473499.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tapotexuka.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/87795852707.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vabitozogilopudisulut.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/21039793158.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/60443136153.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/tatazinolexixuxixino.pdfIn PDF document text
    • http://hla.vn/upload/files/48684696230.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/79316172161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+soul+silver+rom+espa%C3%B1ol+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_off0000bcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAB 20080 bytes
SHA-256: 7b836f1b6dffda2f29016ea764a6602fa911f5e1907949ff1fac610fca09a3bb
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 10920 bytes
SHA-256: 3eb7eeed4b892c24ccce4ec4aa2b333dbdf59cfbf8125d6c375e7c2803e6a619
font_02_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1