Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bec4fbeda81e225…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 19:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edc288bec10ee607750a8439bc094439 SHA-1: b8118f23dd445f71f6bb46bc71c2e5df2e91210d SHA-256: 9bec4fbeda81e225b6b03dffc3d8a9b4c064f0be7f2800035d8e8d3d2852c25d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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, specifically phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=marvel+spiderman+on+android PDF link annotation
    • https://mitrasuksesku.com/userfiles/file/73684107894.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zirugam.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/97671243302.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/33860458025.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/bidolubopoj.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/99363004757.pdfIn PDF document text
    • http://pi-consulting.ch/download/guzegapare.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/42555361009.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/wutilovifizanoxab.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97039029832.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jegenosijabet.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/5180717663.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21986ab9a---lolukizipefo.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/befebezalok.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091419250470554.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/94717296184.pdfIn PDF document text
    • https://filetorme.com/upload/files/42059373583.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/87967850774.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/popezonusejatirok.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/xulawibapafoje.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/89873776271.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/45890976211.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/rinufotosom.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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 17672 bytes
SHA-256: f76bd9ef8574fa935a9eee0cfd960c87d837aa8aed624c5f7850badcdddcc12d
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 10512 bytes
SHA-256: e3b86d621ce2d50d7d97af44d0a99f7cb85335cb4f96da3ba3dd4131bf3a87aa

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