Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21e7adde59f0ed6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 612d1b598f9f7ada4b93d3ecb3995e65 SHA-1: e02f0d081b29964181badf18bfb12a1cb7a15239 SHA-256: f21e7adde59f0ed6e3608686196050dc0cf3ed0d678a02b16e7818f1528a9816
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9d864c4106422fa846473af5289e56f8/nolodigadozolasutuninaki.pdf In PDF document text
    • http://vstarmp.cn/upload/files/20210905_140358.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dabojebugopedadulaxaxe.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zonusudisazopusexejuli.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zugadezopev.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wifezafiwobi.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/97720393533.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jugetibefof.pdfIn PDF document text
    • http://jonme.net/ckupload/files/pujefovupobudi.pdfIn PDF document text
    • https://nexapos.com/upload/files/86249537269.pdfIn PDF document text
    • https://swiz.eu/files/editor/futadawudonafidud.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/53098054575.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/45109222169.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/13620347635.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tasibajip.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sumatasapipetisujiv.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/59073123513.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/25481070744.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-08/images/files/8476040779.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/sajokodudukuzipurabizopox.pdfIn PDF document text
    • http://lblussana.it/images/file/34981829767.pdfIn PDF document text
    • http://allier-genealogie.org/File:/linofowul.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/75607611524.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wuxosatezuxabuzigagizo.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97675672735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+take+360+photo+in+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://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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 10908 bytes
SHA-256: fd37c275416250a4730fab7f383011ba3a7929892ede964324709d343a00a4e8
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 15952 bytes
SHA-256: 2c1f1499361be5fd6a952338468eee66907547d038f1532e4ceb744eb2e10ace
font_02_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1