Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea272478a50a58c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 03:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d28b368e7e5686ad28542686ba5f7ba0 SHA-1: 980155170190e0b909cf9f81f180edc447efee1c SHA-256: bea272478a50a58cb02a9e607862e915b5f5303e66481ec77b74d0652571260e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious or phishing-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://big-affaires.com/img/pics/files/30737531675.pdf In PDF document text
    • http://brukikostka.pl/uploads/page/file/lalozixexojetuganiko.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/tegiwilijeserel.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/gedodolijop.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/68667999235.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/29858310226.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/fedemewus.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6bd28d35---73990472968.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/44736019540.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37863900083.pdfIn PDF document text
    • https://micsys.in/userfiles/file/kifonolagelaron.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/18295061263.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/wesexenejujobufogelogabe.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zufuwuluvazugepef.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/febebokogivijegovomi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/60878007219.pdfIn PDF document text
    • http://kalikraft.com/images/file/rijefo.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/wokelakiwibebuxekofer.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/92550505734.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/ritoxugon.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dcb84468b---91621270922.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/lanogilatipuzotaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wrong+turn+part+6+full+moviePDF link annotation
    • 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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 17092 bytes
SHA-256: e32ac5c9260e71f7cfcdfead2289d25b995360b9c3379918262ef0bbf68b6dc3
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10860 bytes
SHA-256: f9db5f2ac97e6db615ef30876067c40bbba8335614659482fa43a51a14525a22
font_02_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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