Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1ad8998af55917…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 06:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ff86b7e423a906657cb871e0a902b2f SHA-1: d28e651157418016b0c0171ee255937a1502f632 SHA-256: bf1ad8998af559177920260eff4166a1d78cb8926ba50f91f326dd68b9f1c41e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to multiple PDF files hosted on various domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://secretinvitation.net/images/files/67510521320.pdf In PDF document text
    • https://mclandpin.com/calisma2/files/uploads/12763600473.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/vixiwajibewujij.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/22674805188.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9080395f---24313732726.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/66442255143.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zekagodapepes.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/25790974690.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/31774821808.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11433846051.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/33247320050.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lowedotejotudoj.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/visisudagasafi.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/bazabisox.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/tajob.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/natiwexe.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wamipuzipuxebaxoti.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/9150398207.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/77742617489.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/duwemisovor.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161388f6dc0a0b---91220335113.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisoxizulesesodaruviti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bloxburg+promo+codes+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_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 17104 bytes
SHA-256: 64a6a293d8260453f2f924937ea6040363ca90c1787ed187862286ce38e6d37d
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 11088 bytes
SHA-256: 4e102641bc5d276b7e5e64bd36fe32f73745061f915aee87c9d5e1708554ac45