Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b89f323fc1a851d…

MALICIOUS

PDF

72.1 KB Created: 2021-10-10 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c898f922c6ce13daf0bcc07d7702eca5 SHA-1: 7a6248e87c2a14e81156f4b1c85032d79648fff3 SHA-256: 4b89f323fc1a851d798cda352eb623db071e1e85dfc848ecf7e46883a38a53b1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of many unknown URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://meritumptt.pl/dokumenty/file/37027339418.pdf In PDF document text
    • https://istanajp2.com/contents/files/31000778731.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/99688878839.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/6414649274.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/23988190582.pdfIn PDF document text
    • https://sainaudit.mn/File/54858474854.pdfIn PDF document text
    • http://arucax.am/user_images/file/tevipazejizeva.pdfIn PDF document text
    • https://temahr.hr/files/3546116662.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/44198525777.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/41363009728.pdfIn PDF document text
    • https://mauspro.net/upload/files/kisanukokixekozopepasapur.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/somakidusagawamuponugi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/74995610598.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/38655616937.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/87809676180.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/xemufowas.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160e2120f837---gakewegukoxujidemipidu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/22684242354.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/9352763824.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/9374190099.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/vuxezadakelavagezozeweke.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/89707679640.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/31283582892.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/nevas.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumiwazotunemuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+pot+of+gold+and+other+playsPDF 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_off0000b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 16020 bytes
SHA-256: dbb24bfbe6a6f93355ec91d676f83da33e6675ee3cd00c0a0139b1ac9080ec42
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 10760 bytes
SHA-256: e5a07d1d0e7f87f396aa77addb42b8012e9b288b917d3deae69ff730c38b9fe9