Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0435a342b3e22b2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 04:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b08811b3bdbb0fe1a26754fb583242c9 SHA-1: 827e52a1ae7d3a339f8fd3100989af41c6c3331d SHA-256: c0435a342b3e22b2a2a0caaccb79de25ef3a3136ebdb5339a34b89a58b8a8193
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to distribute content or redirect users. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score point towards a malicious document, likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=vanishing+point+perspective+for+comics+from+the+ground+up+pdf PDF link annotation
    • http://world-housing.jp/ckfinder/userfiles/files/gosetiguw.pdfIn PDF document text
    • https://slotpt2.com/contents/files/tomufafuv.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/59110303567.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/8460597007.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/35140771569.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nasujopavipatogeribijupir.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/62437669747.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/57698782221.pdfIn PDF document text
    • http://surestegc.org/documentos/file/xurobozizupedufazufixik.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/padidedatipewubanelamep.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/67981619586.pdfIn PDF document text
    • http://lagrupacio.cat/file/muvaxakapurerij.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/sedisorenerujibelowo.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/76301640921.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/11584489520.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/77901198437.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/626d31be5f33b7abfaa4712d954a683d/jezededenuk.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/ludaxutubesaj.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/12676130886.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/96074081152.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/28485509677.pdfIn PDF document text
    • http://ed-union05.ru/files/file/29739512489.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/57495805129.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 17304 bytes
SHA-256: 65b1843a0cd41b09e4539d11811d9a8b519abadc9fba95979a1fd3d2d4741036
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 11156 bytes
SHA-256: e25de63f7767e147b1209450c816ace06279228fee7810e3b0cb49088064701e

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