Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b24b570602e956…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 11:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c09e4fee9520f771d120f202007a72 SHA-1: feb6dcc0f3dfde2e170541ce89563d92c5ae213f SHA-256: 01b24b570602e9567c33e76d40589e65104abb633e27687430399b8b1e0ed561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to other PDF files. The primary purpose appears to be directing users to a network of sites, likely for SEO manipulation or to serve additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://speculatio.in/ci/userfiles/files/4091512544.pdf
    • http://phutungtdc.com/upload/files/5717360797.pdf
    • http://pincailight.com/zk/UploadFile/file/2021091602571773499.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/21248899625.pdf
    • http://eksternest.be/images/file/11115067381.pdf
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdf
    • http://status.cz/UserFiles/File/xexuzupumaledunujo.pdf
    • https://priscar.com/documents/files/72050822953.pdf
    • http://engcaphone.com/_UploadFile/Images/file/77719378794.pdf
    • http://connectcontrol.net/files/userfiles/files/sarijusegoni.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0d267e6e---95998591990.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/paderi.pdf
    • https://sardavetri.it/userfiles/file/miragij.pdf
    • http://www.andreapondika.cz/file/45867074523.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/falisazilubotanag.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xunibodixani.pdf
    • http://tongkhomica.com/upload/files/mawivip.pdf
    • http://psychologadamczak.pl/userfiles/file/vifowabazugenibutidaj.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614036793d313---gobizevalagusesatep.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/84714873360.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/44294051309.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=show+my+number+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 16792 bytes
font_01_sfnt_off0000ce17.bin
87fe51a2970165e8d9e0e452ef0c71ee3c063fab33b12fcccf5a697b93af58e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 16148 bytes
font_02_sfnt_off0000f753.bin
f5417f9827f47897a30966d1c2a7c487382b4d5c000db6a6dc1e59ed713fc592
pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10716 bytes