Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f32f1163042000…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3e6b2f8c4f72e0446e9ed70b3c88252 SHA-1: 259a997784658216e38555fa7275a3bcf6889569 SHA-256: 15f32f11630420004501db0b7c526bbce28a877439f13802e060ce2d96ae0f3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=find+equation+with+vertex+and+point PDF link annotation
    • http://flexinform.com/hirlevel/file/37115054989.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/renigatazigis.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bupoluwuji.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/34818287887.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/11210032562.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-4/20210904175957833375.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/45980690744.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210902101112.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/44509706007.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/87655824580.pdfIn PDF document text
    • http://www.bash.cl/media/file/84109099324.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614544445c7b6---miwajijiroki.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/maguv.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/rukodaleretusonasiv.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/50410356424.pdfIn PDF document text
    • http://anpo.vn/upload/files/69264522982.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jipusaxofezizikusijawuvad.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/rafatutupawoxusipi.pdfIn PDF document text
    • https://italvaping.com/file/nanomixawabodo.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dazudupoloro.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/2251902855.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/ranopusivonakekow.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tedanofedipalek.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lamukafomidolazalare.pdfIn PDF document text
    • http://anm-av.de/uploads/files/laruvegafabiv.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_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 10752 bytes
SHA-256: 178d85365aaa22fe741da35fd1fd5a616ee0561ee27049c1946f231e76bae527
font_02_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 15036 bytes
SHA-256: 510b3c1ee997dcecd5317acaad303e3381633720ffc390f63aba913c0799edbe

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