Malicious PDF — malware analysis report

Static analysis result for SHA-256 47404f514c09dd66…

MALICIOUS

PDF

68.7 KB Created: 2021-09-11 14:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: be66283169ee9fdf38279cb639467d84 SHA-1: 6fa9bf75945ca054155ad5332f48c0705010bd08 SHA-256: 47404f514c09dd66269a49a9863c1ab35cadfd6a566e6f2cd5fca9fca48e5fc0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daulte.ch/ckfinder/userfiles/files/32326738137.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613673119174d---86786289080.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gukebobimirusamorodedavu.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3654633826133ecd979463.pdfIn PDF document text
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/61442820457.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/liteposapup.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/20938406567.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d90a7930---difedaxewufitixesalap.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/ligapasij.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/julazuvizinumogeri.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sebawujosawere.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/sekaxuvoz.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/89049936484.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/62921826545.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/605426985.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/44959968195.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vebubedarod.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/xisevi.pdfIn PDF document text
    • https://remini.hu/userfiles/file/wupesikokojo.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/vejoluzaneza.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/nusiguwavopabutovogebepot.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/kisaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=boba+emoji+androidPDF 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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 14508 bytes
SHA-256: e9b0bc437c1ae905f5df166d45ee8432df3984fbc571bd836e603802b9694c8e
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10420 bytes
SHA-256: d38bab6e510010aed4186d56f99aef55a133330ebc1a56ad10e27b74db07659e