Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e76ab7c4a2c7a6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 17:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ac99fcc1adf539d5c6379dfc6ef43de0 SHA-1: e5ab0e8e3f28d5942a10f564d7f26c25cdbe3939 SHA-256: 82e76ab7c4a2c7a688b76ab90afbf0da8b1052a9bf1f8f4a3419d1283308eeb7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, many of which point to disposable hosting and are algorithmically generated, suggesting a link farm designed to distribute malware. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arunimaflavours.com/userfiles/file/98768210161.pdf In PDF document text
    • https://izr.fr/files/lewinamamubaxemut.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/42841483924.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/49942136269.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/23173870601.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/negojivonijugu.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/xoritubafuf.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/76164343436.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/guparuwikesuroj.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/romugivovutokosav.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/dodekatepuxikenatomaxa.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/karotoxakajurezukaneriwid.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/juxetusejigopigon.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/04516234cc324c512ba26aba47e6d067/kebikevowu.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/70730613769.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/27694752445.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/3344134582.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/34767174692.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/99036998344.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/73371260812.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/26186988873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=faceapp+pro+free+androidPDF link annotation
    • https://mediaget.com/userfiles/files/gexupixigigid.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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 16168 bytes
SHA-256: 12182bd554b2fdf73e9e7e02c5cb20d60b2be96207a9998e7eeb9a7237260688
font_01_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 10276 bytes
SHA-256: 80ee38b11798d19447da8353605e73ddab6d59aa3aa30b1d548780a0b4299ed1