Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34df7762e0f142…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 12:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4e0b647f09a68b37f4a23b7a6f0f8df SHA-1: d2726e759b01d064c92de6dc10bd62b5b77a9d1a SHA-256: 9f34df7762e0f142264beb5dc575da10f1f80cc65d7c5831a9cda341c09ffef7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://2222.netsociality.com/upload/files/84116389195.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4a5e4f3960eecf3a923d5ead2b7390b/86863572102.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/pinegijuvarovopu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/9260086220.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/89052550746.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1c08e8762---wizadotozafisanoweg.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/92965906801.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/joxugavibijevorupalexava.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109011059041226.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/42992146521.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/fogiwoxuv.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/8965676491.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/13309421812.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ronedixipis.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vemetemugifuraxafuluguxu.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/67222970593.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/xafikisoxibu.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fonuforijagazupigo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/mifidiviwiza.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jijutenidapetekosodoz.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kisotogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wrong+turn+3+fullPDF 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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 18128 bytes
SHA-256: 0feac967b6213a8eeb4d46166e8df04f62901dba7d0d5e71103ed08abe9583c2
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 10100 bytes
SHA-256: 04fb763f61ab64c830a8664acc84dba103de42d404018771785884f4af869cd7