Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce797fb7bec81fa…

MALICIOUS

PDF

68.6 KB Created: 2021-09-09 15:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3a2e46003d084a582706914ee4ac752 SHA-1: aa900cb8e155bd93fadaf5123edb1ff27102c740 SHA-256: 4ce797fb7bec81fabcbb803d4ae343c8b7bddd2177d0d1c60cab38a4235ded44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable malicious links. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to a malicious site for further exploitation. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://charteriraq.ir/basefile/charteriraqir/files/70637820626.pdf In PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/daxajiri.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/davenasewugomujalibez.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/4641574362.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/solipakizoxelojumabefup.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/4477836388.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/65320237397.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/zalojomap.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/wusivigoxore.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/73956603776.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/kunuzoxapumonebugivewiboj.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/jijovepulavonujugovododew.pdfIn PDF document text
    • https://partetesal.ir/data/file/badaren.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2e6fcc3---gutuka.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/nakuwe.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202192158451822.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/52866197797.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/garanimiwoje.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/xuvazoxisip.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/vezadifovajafum.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/24264858880.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/dotinufenagapulof.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/dibexomivutubo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/tijusuf.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/58760099731.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/54160446840.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/99264497324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=amino+acid+translation+tablePDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 13724 bytes
SHA-256: a43ad71f824eee12cd8ca49ab8d5bc4fc3b51ed4162b2fb9a12f8d44c2e1e68f
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 10652 bytes
SHA-256: f82596961b41a805bb2d747c3470870bca0270f2714218747d41b489d125bd35