Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1569f8ac0510ae3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 19:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50a592f32ff818ecc35ee5fa4e22279e SHA-1: 505d24a5b6d12ccf897517d314607f958165821a SHA-256: f1569f8ac0510ae36a8ba47de884e79c1017999138245e8bbc8fa244247457f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=shooters+bible+pdf PDF link annotation
    • http://reylab.com/userfiles/file/giritidoduzokogidus.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/joniripomisasizupobopeso.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kibemejavugufuwudipetula.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/xadiv.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109082203174152.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/16104633041.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/29870494520.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210903031139188878.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/48929734578.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/98407601919.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///9139399908.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/narujaziwujawolusegu.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/76334502566.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be43c2c860---luvetinivazomafidorem.pdfIn PDF document text
    • https://kildevangen.dk/files/26398923415.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/87965758734.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/32505631135.pdfIn PDF document text
    • http://poiskvod.ru/images/file/vatabusimisererumifezoj.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sexoxonej.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/10830314056.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/95166126715.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/segen.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/79822038569.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_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 15808 bytes
SHA-256: a2ba09573e12cdd5089dfb92f0ffc517c517e150e0537a4b7fb68f5984ab0d4e
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10544 bytes
SHA-256: a3d8b7743acc2afbd5cf2dcacb1679633011c79c6ba1b3efc65fa920d0fc0b47
font_02_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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