Malicious PDF — malware analysis report

Static analysis result for SHA-256 8361d576b08ddc6e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 12:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ec8ee24e307ea5779e6182e4a42436 SHA-1: ff42c7c4e7ad38ebf239a97d3f8040580c7e76af SHA-256: 8361d576b08ddc6e159385263049cfd9558d07f5d1c65239a515ffe12d7beecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, 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 phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/ladupowomuxavata.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/22078975264.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/vatiwatawusunutig.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/72036189387.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/83551119246.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/zezigoseloxan.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/95135917681.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/fegurunujidol.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/towerosositogitegurizesad.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xonunalirafutowajes.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/71824946770.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89907941171.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/funopodasixurezubuxatin.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xoxevogono.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091411553882.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/36965690374.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a686003c18---dunefenogubovexux.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/pomexal.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1cb9b199b4498c53dbcdc35529ab065e/33781160597.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/wisetixuzomibebewezexoj.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/39480995447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+lock+my+tabletPDF 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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 15880 bytes
SHA-256: 3544c7ebf489b7b8e611aed9ed2a03d99e5a5690b24e5a6a7253d660391d024e
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10584 bytes
SHA-256: e1d1cc9aff04fd15cf3230875249fd54de1c8a91ee8d72f58ce1f82ecb5ec2a3
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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