Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d5972f9f561b70…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 11:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ce63112cc5e73bf7f663078b91d9d22 SHA-1: 8a7dc1e3be2f93e69d574ab99c2c0bc7dcb4a5aa SHA-256: e4d5972f9f561b70ed373bfc43ab41f2558f76ed1358e2be1bd5b0a9fb0aaa2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://garglob.ru/uplcv?utm_term=messenger+hack+url+free PDF link annotation
    • https://middletonchambers.com/ckfinder/userfiles/files/vefuwonelapikobomodo.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/71640896293.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tikekivil.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d497d5eca---76055007140.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wojijubi.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fogizojogifemazafofu.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/pagakiwavuzuvituzolap.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/32190009180.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/vogozeloma.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sikegofejowubenirol.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/63131187578.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/63937084862.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/surubemerufuguta.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/67383393854.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/fowiputudexedopezuvugenip.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wavejexobix.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353617108ec---52029048822.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zavonoranituv.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vaguzasimu.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/85676123518.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-12/images/files/15248967154.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/filivoderikagalatez.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/dotemikoxoxilowen.pdfIn PDF document text
    • http://bushurov.ru/images/files/67446511664.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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 17028 bytes
SHA-256: c2f51448a3eab60a28883e6e6e9e7d00c2bdca6cba58c1e9d4109e5bac317a6e
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10488 bytes
SHA-256: ce0da4ac0b4671d76a4e54ccb87c77e47372de652e1b8ed2a42ea2af9016c354
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1