Malicious PDF — malware analysis report

Static analysis result for SHA-256 5843ddd13e9259b3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 19:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 870bbab3f6c03da1a756b7a64e15ddb0 SHA-1: 720c2e29d5faa8b065c2713f70927aea1e9f1a03 SHA-256: 5843ddd13e9259b37e976f036fa1f7c9488278c30e10e999709ec3eed8fbd9a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, aiming to trick users into downloading further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://khangvietdn.com/uploads/file/51661779022.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i9lrt9521ne9kc00em61k6hef9/binibafizemixu.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/52923774729.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84968139268.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/boxixawapujexabibuxoj.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/31737454569.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/gawulilekukugesegufumezop.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134865666a52---46874817446.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/93181258625.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/kupodupozanifefukekinu.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/84666528565.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/10229446709.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/94435859369.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a86178945---pugonadozakadifovemeban.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/90799116497.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bowutoget.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/49389890153.pdfIn PDF document text
    • http://usagimatur.com/files/others/dogeranoxoxoj.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kumaliwezuruzovidof.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/potutupulo.pdfIn PDF document text
    • https://renault-service.com/userfiles/35976585731.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/gojawog.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezunefeduwuxom.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nefewo.pdfIn PDF document text
    • http://land89.com/ckupload/files/37493437991.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wozosenune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=magazine+free+download+pdf+sitesPDF 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_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 10812 bytes
SHA-256: b52a162088bf4f2ec776c4b57f4ce31601575bbc2a7887cbc3f9afc4ec74145b
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16900 bytes
SHA-256: ebdeaa6050d9833c4955f177df900c83765e3784d9d02718cd81d9e424953718
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1