Malicious PDF — malware analysis report

Static analysis result for SHA-256 5315fbbfdf23e565…

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 21:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de16eab73422ea7596d1b1885e30cb3a SHA-1: 623417c4122f31efe186d83f342fa2a47617397a SHA-256: 5315fbbfdf23e565b9cb9d9b24b93573d29a9a1992b5479963ce21379fe15a8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=boruto+198+watch PDF link annotation
    • https://parc-hotel.info/file/nelasazawivimerebelose.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/96649687853.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/moxamejeviliriliwogidoxal.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906010955.pdfIn PDF document text
    • http://groupkaishan.com/d/files/bowelipe.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/89556877220.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904045027.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75616548444.pdfIn PDF document text
    • https://felicityokolo.com/file/gutoba.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39557868644.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/20994788940.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/lunexejev.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/4084946007.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/52056035898.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b42d617ee---62084199124.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090523545839.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/xigeliwu.pdfIn PDF document text
    • http://rapet.hu/files/28834437818.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fuleloro.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/93592627476.pdfIn PDF document text
    • http://demkapi.com/resimler/files/pazetimawopateveg.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/zezopo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7tb5n7jdrn8ulc7pdkcck5ohb6/bugasi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/85671465739.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_off0000bb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 10452 bytes
SHA-256: b6d35937a832720878f1f97dbd87e551b18dda1dceaa3cbfc84c04fc64098d72
font_02_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16872 bytes
SHA-256: 7069d948321b96b51841939f4d556211be38971098faaeabc63cf780d6d10ab9

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