Malicious PDF — malware analysis report

Static analysis result for SHA-256 b095929fa4ff9d7e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 18:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97d1cdc3672e159e78a91a54b31575cd SHA-1: 273383d3666b95577619bc1529134cccc4623773 SHA-256: b095929fa4ff9d7e0352396948ad0060b17a5b6060ea0b580f0203f51136ab47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host many links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=online+multiplayer+games+ios+and+android PDF link annotation
    • http://taxilitomerice.cz/ckfinder/userfiles/files/27527747587.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_115608.pdfIn PDF document text
    • http://ipceurope.com/assets/file/96179830138.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/migixa.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47979081527.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/butefeviduzifojawitus.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/witogilofuwiwevijux.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906022247.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/bowovaxasi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/vexolenofigarovi.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/kokex.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/xulegijazir.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/punuzaritasakuvamazixomu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/xavusevuxivanuvuluzew.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/fewefenosuruj.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/jidutaseradogesowa.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/68035119286.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/waxolovomububodarudikos.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0bd7aae9---tunusifukupuxidarugu.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/pidaporere.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kajapixubofebuda.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/rodomifapikakadodajazonaj.pdfIn PDF document text
    • http://etre-belle.su/images/file/35379704157.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lopiradalirunogudak.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/90220338743.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/mamazosuwilatovobapi.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_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 10976 bytes
SHA-256: c3e99da261f434f31bdb2a01f16f64cd5b4e47dae87e826bb2c7c3d1cd0da16b
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 17280 bytes
SHA-256: 5021cb610bd01c0327c89bcc7f6747a867e52700b25d0515ce0f23a596e6975c
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1