Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45b1e61f1208aec…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 20:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 034422347b59d885723811deb9741fa0 SHA-1: b9bca7f5d85ea29fa1a7d3d6ca2f7a1fe120b1f1 SHA-256: b45b1e61f1208aec4cf8249ae18501cd025e708649910facecd76c49a054e055
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are likely used for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the embedded JavaScript potentially executing malicious code or redirecting the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=free+robux+username+and+password
    • http://hoteldazegliotorino.com/userfiles/files/89024303299.pdf
    • http://adec-interiors.net/Uploads/file/mikivarubabim.pdf
    • http://casaledellasignora.it/userfiles/files/6781388348.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42741393503.pdf
    • http://mega-treid.com/userfiles/files/33923966818.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/43017871284.pdf
    • http://sarljarry.fr/userfiles/file/41475172364.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/95207908837.pdf
    • https://mvmdigital.gr/files/files/6529064175.pdf
    • http://chaitraglaze.com/uploads/29430830768.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/komeberudemotuwuf.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/patokakowokerumenato.pdf
    • http://vasekurzy.cz/userfiles/file/disenuvajis.pdf
    • http://www.stemcellhairclinic.com/files/files/94696084538.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f262bb6c45---62194403367.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kisogumerero.pdf
    • http://trunghungplastic.com/luutru/files/gijaxatu.pdf
    • http://czpohledavky.cz/userfiles/files/xosasopifepekiziwo.pdf
    • https://hurghadalife.net/userfiles/files/19390477489.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mogalotafojixo.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/40291262604.pdf
    • https://kudamatsu.org/userfiles/file/xaxefoku.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/fiximejitutososijejisefi.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427b2c0f61c---15270019113.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/kamavuvese.pdf
    • http://bankerz.in/qpic/files/66368524310.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b56f.bin
513d292b85efc0d312f967a242017338977b0d5154135d29bc33e256270bd1fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 10724 bytes
font_01_sfnt_off0000cdd9.bin
548f34dba6527b7835b35d97a1ee4c6a30f60696b79cb22c07deed3dfeb704b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 15100 bytes
font_02_sfnt_off0000f3e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 16792 bytes