Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee27b708ad88d0f8…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 05:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81fdd546c064a78adab068bfd19ee4f0 SHA-1: 7b41f479fa4c826351a4faef2c8bf14bad8e2eed SHA-256: ee27b708ad88d0f8d2b8959cb85605452b26c50717fc1c81b3ad6c53c34daf75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bygreenpure.com/userfiles/file/bumalubasojonerigorikave.pdf In PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/rurutifusubepevidubi.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/71461458332.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/16718385330.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/mifopudoz.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jirebunimipijag.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/ginepoturirovuwi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/lemafemapi.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/68622158950.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161430929dfbac---piwejam.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/devumerobipimera.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/28016295503.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/sepekogo.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/zolusadurogowozaju.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/bifuxidu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/16662812638.pdfIn PDF document text
    • http://koala-al.com/d/files/jozojegumazasubo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95312585568.pdfIn PDF document text
    • http://khocabien.com/uploads/files/79126240514.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/55035197172.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/debelukigomulaku.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/98314086280.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/23147212343.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319e628eaa2---9501378708.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/dufutilimekax.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/11321427225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=realmcraft+house+ideasPDF 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_off0000be67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16204 bytes
SHA-256: 0791039c921e3e60369f05fc9161ef4876a18e9a75f3c6a664093db44e803cf5
font_02_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10780 bytes
SHA-256: a8db5750cbe9d18ae209251a90ec8130b864d47ac6229391ed673cb655575bbb