Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fdc4450066d4de…

MALICIOUS

PDF

70.6 KB Created: 2021-06-10 16:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed93da5a38054cb9cd5512cd200c9861 SHA-1: 09822100e5e08866662f27abd70a5072ec93fafb SHA-256: 15fdc4450066d4deed4f454794d66cc287456ec40fc90a662fab29d06dd5700a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent URL, 'https://crewmak.ru/pbw?utm_term=tom+clancy%2527s+ghost+recon+breakpoint+download+free', suggests a lure for a game download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pbw?utm_term=tom+clancy%2527s+ghost+recon+breakpoint+download+free
    • https://biditeso.weebly.com/uploads/1/3/4/3/134339176/xugajugelokot-mufiwisuropabub.pdf
    • https://ranatugirebulox.weebly.com/uploads/1/3/4/0/134017659/8e085b500d0f.pdf
    • https://vetaguluxidi.weebly.com/uploads/1/3/4/6/134656260/mulopopo-jowenuxarinup-peletuzug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kemuxin.pbworks.com/f/lobomedijifugoka.pdf
    • https://uploads.strikinglycdn.com/files/34c80dcd-9022-4820-b0ab-9bb02f8be53c/57808465961.pdf
    • http://tufukamapaf.pbworks.com/w/file/fetch/144498351/tableau_diametre_tube_cuivre_frigorifique.pdf
    • http://lakebimutep.pbworks.com/f/craftsman_25cc_4_cycle_weed_eater_manual.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144724734/pelicula_completa_en_espaol_latino_sonic.pdf
    • https://uploads.strikinglycdn.com/files/57cbca01-4664-46ff-a0b8-b50989b23bca/187091003.pdf
    • https://uploads.strikinglycdn.com/files/7819f4ef-7b05-4c28-ab0f-b51a2c229399/73517242770.pdf
    • https://uploads.strikinglycdn.com/files/abd236ef-2fdf-4b9e-9b3e-dba3e835e308/what_comes_in_the_nespresso_signature_welcome_gift.pdf
    • http://poxanoralanu.pbworks.com/f/ap_yaynlar_11.snf_fizik_1._fasikl_indir.pdf
    • http://guwodav.pbworks.com/w/file/fetch/144896319/juvepanadozanozumizi.pdf
    • https://uploads.strikinglycdn.com/files/aaefd8e5-5fda-4606-aa69-271a26c1f87a/sopa_de_letras_del_aparato_digestivo_con_respuestas.pdf
    • https://uploads.strikinglycdn.com/files/88b05370-ac1d-468c-8b46-b7899baf51d6/cashflow_101_game_free_download_for_windows.pdf
    • https://uploads.strikinglycdn.com/files/8527d136-0b85-4dee-9853-4d8a3cd72dfd/mawoxosorubuxupebefuje.pdf
    • http://giwupiraride.pbworks.com/f/renolorelimurifolilesowi.pdf
    • https://uploads.strikinglycdn.com/files/3e9fd8bc-e142-425e-abd0-4e99843750d1/reading_strategies_book_by_jennifer_serravallo.pdf
    • https://uploads.strikinglycdn.com/files/0525ab51-2486-4eb2-b547-d20a3e9ae200/jakuzo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ec.bin
14b45629a0a3cf7afd071f2d37eb3de0472c7ee94faf6627d45077d160db9c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 5952 bytes
font_01_sfnt_off0000e824.bin
65ff9f67f625ba88ef21933f5278c5e4af82ddd5055ffb6b66db419de7733da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 11060 bytes

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