Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6f7ba6637d7a51…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 16:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da990705166a0e935894b2ccdc6dea52 SHA-1: cb23bfe234a6c4649b7d042a3ffdadc3ce461633 SHA-256: eb6f7ba6637d7a518503691d6b3021c98159135b4d76b77b7f82cb9aeae4b486
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm. The primary function seems to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://f-okinawa.com/img/tmp/file/fesaxe.pdf In PDF document text
    • http://wgadget.com/file_media/file_image/file/gibazobitoxurukawi.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/51394602677.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///tefafese.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/4860976299.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/24159399962.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/96686972788.pdfIn PDF document text
    • http://word.mn/uploads/assets/basewunufezexefozixubujo.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/53154445311.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/85657755788.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/sixeliramexa.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/63717304808.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/66515631457.pdfIn PDF document text
    • http://posuni.com/userfiles/file/dogasiwovasuxigenugux.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/76587394769.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/64501802763.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631471615246306776.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/54703300410.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/4472958970.pdfIn PDF document text
    • http://premo.at/userfiles/file/fupujuwasokisimeduxuxanib.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/wogagikolekukilewikidagos.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613367d57e55e---52320552160.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/36049638424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=karnan+isaimini+2021PDF link annotation
    • 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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 18500 bytes
SHA-256: 0a137984bd175c2940d3763a6ade507d8d67815c06f82af59791443a753d7993
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10160 bytes
SHA-256: c4e7eb19b49f27cc5fcf46869e850bb55b94296d1c37e97dfe8326ad4f22058e

Open this report in the interactive analyzer, or submit your own file for analysis.