Malicious PDF — malware analysis report

Static analysis result for SHA-256 d121f4618a2398b5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 14:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d630a35fed8513ade17db7a22b284b9 SHA-1: a81074f7b0955257a517d49fc35928486a5e4301 SHA-256: d121f4618a2398b5173fa4fc08ebc5fe4de0122f6fe492712f1e4b230b5d3324
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=benim+hocam+co%C4%9Frafya+video+ders+notlar%C4%B1+2018+pdf+indir PDF link annotation
    • http://amandatour.ru/js/ckfinder/userfiles/files/39650496414.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/gijate.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gudatizisebebaboz.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/95272233869.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/1220079092.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/2444232041.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/jebifixolosepikuzedazorax.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/wewilemox.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/71933438936.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/11902129180.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/supobutimosofi.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/74474836835.pdfIn PDF document text
    • http://c-six.it/userfiles/files/koderasimit.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/6909614172.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tadodafatisutisopi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b42b325f9---21104439105.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/zitisedurenow.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/87607117468.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50522531488.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/koxesu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f039c1b93d---nupuzevanax.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/xovavojuvawawa.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57523890075.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 20036 bytes
SHA-256: a1ee09584fea0df7c9ea8357d90e3751f25206816016555e686f2cc41ad8852f
font_01_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 11900 bytes
SHA-256: 17d2ac3469fcb51e29bc903d33a4060fb63c4c8d33d52174acb8324e29010591
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1