Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec7d5e46914ed5b…

MALICIOUS

PDF

97.2 KB Created: 2021-09-20 01:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b597e1920ba1d6d86d847a79dd907ef2 SHA-1: d31da856bd0d8dd8adf48103fc7af2b3df240391 SHA-256: 8ec7d5e46914ed5bf8ec2160f91998e1812f467ca1721bdc1444cbfad91cc049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm tactic, often used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://libertyrealestate.in/ckfinder/userfiles/files/86758816373.pdf In PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/wagipod.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/87956319684.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/43888436390.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/bakelitokajiwimex.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/delikalurekekifiguzoxijo.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/welipaf.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/likere.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/59180825911.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/2534695357.pdfIn PDF document text
    • http://halanmilk.com/upload/files/21747293557.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/rijururozimubilidubu.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jufaxogiwevugudali.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vge89cid8fnint7qeh4bc9hnt2/xosagexuvos.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/woxoguje.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/88295097950.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e5ae1332---42243792521.pdfIn PDF document text
    • https://blv.by/upload/editor/files/94998789303.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/96243000956.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/migikuxajagetoveliwo.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/zajejokuxenetepitelo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/mixilitinojax.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/55547330769.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/67166548521.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/wokitenijobirivuji.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/nukatixozed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+developer+upload+file+to+serverPDF 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_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 18868 bytes
SHA-256: 80d5b4398499ee495ccfab15b002cd32e91e9f2c042d0d03690863af265d37cc
font_01_sfnt_off0001464d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E64 10636 bytes
SHA-256: dc17c5cf5eff1359b55e39ee82d9fdc9dd1e8630c27b6f3b21af4450011a6417