Malicious PDF — malware analysis report

Static analysis result for SHA-256 de236534b06b1603…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 20:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31a6793c90068554e891cc9d609ec0a1 SHA-1: 526f78df3e6f57ab027fb024a01d7a3af36a5371 SHA-256: de236534b06b1603b1d93adb217cd41bd041bad7ba4ee987fd6c09810aa808f3
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and presents a deceptive full-page image designed to trick users into clicking through to a malicious URL. The document body is heavily obfuscated, but the heuristics indicate a phishing attempt, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://lamelove-zakryti.cz/userfiles/file/2214223314.pdf In PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/30580685406.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91595380191.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/85886064503.pdfIn PDF document text
    • https://lesura.net/userfiles/file/30079906572.pdfIn PDF document text
    • http://abnicum.com/files/file/44104834960.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/91119665885.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/31934594110.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/36580472112.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d185558d7---degagetavimazar.pdfIn PDF document text
    • http://schokofontaene.de/idata/98574024644.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/afe283b1065f77d4c382322ef7e589c2/97666829442.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/97913018872.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/96203761174.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/31072928672.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/jominoremebemivexaxetudo.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/bazazegulovaxatovopezavu.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/nimumoraxifiwogo.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/nufez.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/47570506945.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/34053598825.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/52453072719.pdfIn PDF document text
    • http://gerocuki.hu/user/file/komodezet.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/23541296874.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/34615773342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=app+launcher+apk+for+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_off0000b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 14232 bytes
SHA-256: e872ecf1812e92e4cd923a730e7d8f680dd43889388cdc4ad5f409c48ccf1907
font_02_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10624 bytes
SHA-256: e05e345b0dd52acc7353deac77f25d4a3577b2d288871efc38d5c6a3368d8ebf