Malicious PDF — malware analysis report

Static analysis result for SHA-256 d732712d50456428…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 16:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e172494f695ee8c516c08b85a8363f99 SHA-1: 9c81e5d735d98e4ea72512a6755750f5c558fa66 SHA-256: d732712d50456428322d2f77b298dd49ef65f97de7da4aa3180c753f9448ae7f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which are likely disposable based on the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://nomylo.ru/uplcv?utm_term=hacer+copia+de+seguridad+de+aplicaciones+android PDF link annotation
    • https://bcm.es/files/galeria/files/rogajekezamexivezurog.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/24735198538.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jikijerosif.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/felemadazezazam.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/95136534287.pdfIn PDF document text
    • http://bubb.cn/up_file/file/69815805524.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/11478536635.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/41753303794.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/45751872504.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e27982af6a---95480154021.pdfIn PDF document text
    • https://kueapem.com/contents/files/94090491783.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109110349034092.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/80808730676.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/keduvotaz.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/64495176778.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/83489873487.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/roxelotupimuruverovebeda.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210912000143.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/merejelepirexitudi.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/mafugararagipovuz.pdfIn PDF document text
    • https://servicepapik.ro/files/5168989160.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/33138681731.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/88032483484.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c364ba71af---23213253093.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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 18372 bytes
SHA-256: 0ed37f4e08412302ddad1c7cb08abce4961c24124aa63be548e94d27589500e7
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 10684 bytes
SHA-256: baaf707a7ca9fe88280a5fb29f8540eb3e4d53e24b277e7e97020c6a04556bef

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