Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f081e857345293c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7a7a7a1c838a84a97ae5171940f3562 SHA-1: c9dc189e979920476892a5da779dd7666bba15d4 SHA-256: 4f081e857345293c391972ce63466d1702660773aef938b77bdaf8fb7b948d90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=the+best+health+app+for+android PDF link annotation
    • https://bushregenerators.info/userfiles/files/80863666341.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/zulezufeveluvifiji.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/rizufuni.pdfIn PDF document text
    • http://szwygs.com/upload/bazeginilatibasaxo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/97221217492.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/gavapo.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/komutizewebadojarugisogex.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/wekafipegure.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/bubibesosug.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/bedovumaviwalidiped.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/frmgeesasn5cpnat7lqmkja531/11158786547.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090424034312.pdfIn PDF document text
    • http://orenprom.com/img/account/file/libel.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/pilizisilopuxizasave.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109092226541938.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/38136802159.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d511aa24b8---gopokesepamel.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vamixadiwuxumatedo.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/64197531711.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091109235373499.pdfIn PDF document text
    • https://digireg.si/upload/61937318817.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/dulenemifati.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wexedekevadisigifijokemus.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/81871676548.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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 10696 bytes
SHA-256: cb3674a59ae0f5b41671548802c7301ab736b02d8caab215c2f584236386c454
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 17380 bytes
SHA-256: 48a29438449330a0c209702eeb91d4fdf6e1cf53a4ec9361c06510288e29c551