Malicious PDF — malware analysis report

Static analysis result for SHA-256 135d257ab7f86016…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 13:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b1f8a49180ea40aa95d9b851ba5f458 SHA-1: be84a9cdf62c25ac449792114f868c72cf0d7b64 SHA-256: 135d257ab7f860163eee0ce5e549fa557479458a7d59d639eca852d907eacd28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs, one of which is a link farm designed to redirect users to potentially malicious content, disguised as a game hack download. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous external URIs and the link farm heuristic suggest this document is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=marvel+strike+force+hack+mod+apk+download PDF link annotation
    • http://global-leasing-management.com/uf/file/jekisopefekafupaxa.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qudp7j18dgo46ene79mnvacuv9/71079429171.pdfIn PDF document text
    • https://keongracun.org/contents/files/koliwodixofisijekovoniw.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/doradarupam.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/dukefozeg.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/magazotaletozezofomigorof.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/82109528983.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/26017079488.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8b2044c5---gediwenexavipodix.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/34999166678.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/bumekud.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/muwaziwufepu.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/jizawubewodotiwanaxu.pdfIn PDF document text
    • http://7profi.net/userfiles/file/duvenikabusas.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/82321711932.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/devazed.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/vojulire.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/mosexupoga.pdfIn PDF document text
    • https://tigaintan.com/contents/files/jobutinuxireki.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/pokuvedowasegapopobibodu.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/muxutavamanasusumidof.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xumolizasenatamex.pdfIn PDF document text
    • http://nfc.soo.jp/file/sasogujesadika.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 11120 bytes
SHA-256: 392b69428317fc4ad2a38e6dd43ad5bd03c505eeaaf35434cf9542043b24b205
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 17992 bytes
SHA-256: 86ca0846707cfa4516e0f90f0ee694b0dde9e9deb402d7ad6043ad6974cf8f9d

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