Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7cf74eba850881…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 18:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0db21e5298ced2300f3ed20585f6b2a1 SHA-1: 34ede811c1a7b5f10117c14195cd94944345c321 SHA-256: ba7cf74eba85088139bd94be138d47f6d925d8729b8ebd135954a90838ba9bc5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme leveraging numerous links on disposable hosting. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=tube+mp3+player+apk+download PDF link annotation
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4a555778eb604cc160f478af7ef7cd32/78868223952.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/87039663704.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/28895632411.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/1499050915.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/maluzesujekofakugekuraku.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/73158976529.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/2922779933.pdfIn PDF document text
    • http://freetds.net/userfiles/file/nutigome.pdfIn PDF document text
    • http://yjccnc.com/upload/files/42600213850.pdfIn PDF document text
    • http://ebus.cn/up_file/file/21585797323.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/tofejejuboven.pdfIn PDF document text
    • http://thevalleytrader.com/files/3612866835.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/68187933091.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/69159065584.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/88527054337.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/sidadamivegubifafarewuf.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/vapavelelefijagepipavozo.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/42951057698.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vukuzezipipod.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/17662066604.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161335abe453dc---47912435082.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/66910084300.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/71412354361.pdfIn PDF document text
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vobosekaxiforobox.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 19604 bytes
SHA-256: e84aa2fb18728cfa6b0225debc498bea5e7026a0b7cd9eca61082afa3ee15882
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 10864 bytes
SHA-256: 7a16c2afe4c460ce2fd03a88bc9f7eeffe2c4c39e15ea3708fe2b028f7882afd