Malicious PDF — malware analysis report

Static analysis result for SHA-256 303cc5dd09c87503…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 22:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f77c20d5ce92dada396bbd883571c674 SHA-1: 56901a92be2c0c0268e7020289d7088f40c70ccd SHA-256: 303cc5dd09c87503dc0bb0980a31abe7419c3257c81618c64b93b2cd2137f4bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=free+instagram+followers+app PDF link annotation
    • http://fedime.org/imagenes/10121060219.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/2747393331.pdfIn PDF document text
    • http://intersonik.eu/upload/files/67070295850.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/39203426402.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/pulatotobefujoxen.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fetosapilogumewopipimu.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gurazezotogew.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xogodomopajokemonusoxobaj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8212d5f---jajive.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373104c62e7---divadatebumopomav.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/94017078608.pdfIn PDF document text
    • https://eniedu.com/data/file/20210917144316.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/67577092960.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/botajadobuxatiw.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/67981029508.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/nisituzedabotokedi.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/xibisokem.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/bemagilag.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/63266742785.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/20172038326.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/giroxomoralamuzawop.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/70248277651.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///rezezixuvilax.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87324431299.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16880 bytes
SHA-256: c055ee79c8ce699a2b561d72ff125f32ff68997acc0dd3f7b8886ea483527123
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10764 bytes
SHA-256: d3f8995475b231268e84ae55dd9ad6df4559d02bedb60e19b248e5365a5164e7
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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