Malicious PDF — malware analysis report

Static analysis result for SHA-256 940ea94399112087…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 09:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef24d95822b234c7415d4b447a0aa285 SHA-1: ac1db6249d4cb19d2a9d9b645212e7bf0eb5924f SHA-256: 940ea943991120874579ba81f410df013111a48b905f2e076923ba0d43330979
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or phishing attempt designed to distribute further payloads or collect user information. The ML_NYX_PDF_MALICIOUS heuristic with a score of 0.998039 strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myxroad.net/upload/userfiles/file///11226751837.pdf In PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/438689670.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/jafilegax.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/38413695955.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/polebupalizoxafepafute.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/34420597755.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/22438598645.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jugowizetarofamajivejudo.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/14747354052.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68187427514.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/zabodafazusame.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/42522113034.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109050802205022276vkjs.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c819a3c84---xukolapiwuwuti.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betasupikasik.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/99570018313.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/zojorivakonubodajovunewek.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/jawokifabi.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/52072609798.pdfIn PDF document text
    • http://klinok-saintp.ru/files/wiwixubugi.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/94032306284.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/18916709180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+indian+app+haiPDF 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_off0000c174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC174 18180 bytes
SHA-256: dcd86cb6020b04106847b92f72093da749f08458b48fc077d7f62f2e241575d7
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10192 bytes
SHA-256: aedbe71f3185dd9c6906c2d9fb5a99d284d1b64e4e085fb15b4ce46fe666f5ca
font_02_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1