Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6584600410bec0a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 03:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22107384b3e7f6c9221818d875bc40f3 SHA-1: 52bb29d308eef9d2516c94b5a6db56c2dbc082b4 SHA-256: f6584600410bec0aa3890164a454787e2062620f41370e6230d58a1f0d629b86
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests the PDF is designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=how+to+share+file+mobile+to+pc+wireless PDF link annotation
    • https://thefertilizerproductionline.com/d/files/vusaguro.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136da2fe68d3---girifofikamemakugirikuwiv.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/ponisifomebifogitode.pdfIn PDF document text
    • https://mcsfood.com/images/file/43746488704.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/18243185402.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43432504444.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908183156.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/xulazotadux.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/539784290.pdfIn PDF document text
    • https://orrizon.ru/images/file/dubowodedo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lodegara.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/35548479027.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/wokomo.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/18101890766.pdfIn PDF document text
    • https://aaaxxion.info/images/file/talazevavunuvigoxarose.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lodalapizegejam.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xupibus.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/rixaz.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/86141603587.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/23817565890.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161317f1dc261a---13221235683.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908022042541741.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/zivapas.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sozirubumojesuvediwob.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/73040852004.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_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10860 bytes
SHA-256: 64367be0394a5b4736725f9b06372903e0b78cacf39e08f3e317a98f5e1052a1
font_02_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 16488 bytes
SHA-256: 0704b191ea8250d658bc31ef2a58ad2fff2169e406599d25c74fbe7f2ae3174f