Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f91234fa92eb862…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 21:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3fa28c8173ea1f1f88274b2dce3129e SHA-1: 0d70b0b3ed8e5184cf44bcce85e380cfd3b314c7 SHA-256: 7f91234fa92eb86276a3f976967e9df7a126aadfcff3b638a40cbf7a12a756c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=harry+potter+5+full+movie+in+english PDF link annotation
    • http://www.casasemio.com.br/ckfinder/userfiles/files/96136245774.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/30089401842.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/1097905337.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/84518421852.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/85547485481.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vowudadifubukuzaxubawezox.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/kosekegikuvusajudenan.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/lusowefiravutelosup.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fagufobedibevufujeriwepab.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135d79cd1957---dukewexetal.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/3521002129.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/jemizuvujugoj.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/kofuxafoferisuvamatax.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/nisibelesomuguf.pdfIn PDF document text
    • http://grabnerestriche.at/33102258694.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/memanurogobuwezal.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/77205042110.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/81329402244.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sabinotutini.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb8abebee---mesusumo.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/vukolafolokituxu.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/13057513413.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/89762902528.pdfIn PDF document text
    • http://beril.cz/userfiles/file/7412485894.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_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 17780 bytes
SHA-256: 368b2cefe987d397576e0f10325231545ed8c6617cb0b780d2c928f044247b07
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 11208 bytes
SHA-256: 2200560c9313faa1c4a42747de2ef061372b40da9311959d46d0b0db51080464