Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f15ce24eaad9a30…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 08:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff736958a9d608f8e9acb5c408cf15b0 SHA-1: 332f33e65fa88e38ac8252eac87466a830fd7d4c SHA-256: 0f15ce24eaad9a300ba6722ebea8f382b2ec297e75a8c2bc9e8c7bd846f00ac4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=stylish+bangla+font+for+android PDF link annotation
    • https://termokingbt.com/ckfinder/userfiles/files/sovuxivifo.pdfIn PDF document text
    • http://abnicum.ru/files/file/44025222630.pdfIn PDF document text
    • http://cutskytools.com/d/files/giviretedog.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/69202117278.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/36233814996.pdfIn PDF document text
    • https://angem.fr/userfiles/file/rugisagitukex.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/79605638228.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/bularadoromijujenexigan.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/solidudisasedeko.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133549d36f49---49293559981.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/40878974332.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/81747694217.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/rafasusukapumeva.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/namemupuvedulifake.pdfIn PDF document text
    • https://masukpt2.com/contents/files/27717311944.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/wamonep.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rabatiwaximure.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/93863472053.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizifu.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/mikejefosid.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/sipuwaruzuzagomokudeluna.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/28800998920.pdfIn PDF document text
    • http://elitacasa.it/images/file/32665567493.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/gelarolazobad.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6255d6961---99521161634.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_off0000b6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF8 18232 bytes
SHA-256: 181bad8eebd715f18312b2a33e702dab3472185ea31d2f57957abc699600ff8e
font_02_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 10828 bytes
SHA-256: ed82d6d513bc33c4cab1d97e41c40670ac43204026fce892ecdef0cf0d1d285f

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