Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f030d79d5912750…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 11:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f38919e4a85ceef977586746891a621 SHA-1: 6ae9ea56dfda3284bd88fd988e34f6d72c894435 SHA-256: 5f030d79d5912750231d7b4681b7c40cbaa922d107b9c3ad670487ef3dc8e752
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=streets+unlimited+3d+mod+apk PDF link annotation
    • https://isosklo.cz/uploads/71456182147.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bajapumunenowat.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/38938006490.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ximodene.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/13968502294.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/96445545245.pdfIn PDF document text
    • http://logicamail.it/draft/media/71894728940.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/2444311514.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/20424116738.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/34615412530.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/59353892770.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/noxabipodadajuze.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/lujuvugewumarigi.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/fezidiz.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/97002070485.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/13907551920.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/65348944355.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/mufafumigaz.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/26734374033.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93084453765.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/82197655761.pdfIn PDF document text
    • https://shinaltd.ru/images/file/11168758076.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/195ded8aa95963e5e535a742ed5e89c0/61107180872.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/74766299798.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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 10992 bytes
SHA-256: e2fcc50e016ae16263b7bd9ffda9a670ccadf04ffc52099ec1c3ac0f947c307a
font_01_sfnt_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16140 bytes
SHA-256: 7fe9846faa97d6349ff4efae06775a1ed1824c29cc22caec5b03b05ce3fe0a0e