Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b77f9d564644c4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 22:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 646215828dfc0f8a99d70a35ff1a309b SHA-1: f133d41cfd1ce7a91c881f7a884045de61fefe12 SHA-256: 20b77f9d564644c4cd58b7532282bc0e193de42edd77cb0c47e6d0d7fdbe39ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a large number of external URLs, many of which are hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=the+joker+putlocker PDF link annotation
    • http://congtyvima.com/images/Download/8367081888.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/rovolesarewobudulam.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/rogaganizodosotida.pdfIn PDF document text
    • http://glassick.com/userfiles/file/62284786664.pdfIn PDF document text
    • https://best-label.com/upload/files/zugokus.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/saxedifip.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/5842684090.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/43234051434.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2e115ff088c2ee37d5a258712353c93d/gabemed.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/roxuzejamufubuj.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d839f6a4e6---xujixoboj.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/53649769703.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/josizezejamixoki.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/fevefogala.pdfIn PDF document text
    • http://rurisnet.org/images/file/20769337670.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/dizozugefabopu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tokijegameno.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/punitowuvatifisaparoz.pdfIn PDF document text
    • http://mebco.ru/images/file/soguwukoluzusibijidosud.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/35334954031.pdfIn PDF document text
    • https://empresa-venta.hr/files/4701864038.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/temodezog.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/61916778058.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/tojakepaboweroxufesomuf.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/75996962408.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 18032 bytes
SHA-256: 6d1a4444644405111a6c22b0ba880284105ba85af90a1acc9deb30adfa58eaa3
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 10232 bytes
SHA-256: 9e83cb8ac56ab932c08862e9f7e9f17ba321826f92e3118f1550f7ca7022cc3a