Malicious PDF — malware analysis report

Static analysis result for SHA-256 a429a8cf0dfa2b81…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 18:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88319d2963c939dd6fe3b0bd726b0d06 SHA-1: b301a713f3fd9a2636718f67a8f7b3c11b1db446 SHA-256: a429a8cf0dfa2b81ab51f0acd9b65e3abfdcedc2efe50a8a6e96f9f6bb1039e2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the document's primary purpose is to redirect users through a network of potentially malicious sites. No scripts were extracted, but the sheer volume of suspicious URLs points to a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=comet+hitting+earth PDF link annotation
    • http://whipitleather.com/userfiles/file/48604103080.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/01te7q020ekh8tej4crbfv6ltd/fevedosibej.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905161756787.pdfIn PDF document text
    • https://wmu24.ru/media/file/ketajonipo.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/96462511872.pdfIn PDF document text
    • https://msvadba.ru/files/file/didaragobogizuverixofoma.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/xegafivovab.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bapotepipafekumik.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8536105538.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivulazewole.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wamodazivopidisamubopeke.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/domibadofiwetexum.pdfIn PDF document text
    • https://educhina.mn/editor/files/4461238560.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/64967704596.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bobet.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/topokageva.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab1e9dfaa---tomiditutalirulo.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/kifubezo.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zijukabederowajesasugizi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/pigebe.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_171115.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/44943420846.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/34075775909.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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10372 bytes
SHA-256: d787fbedb0acf2024e6c754e60b7d1badb8030c546dfc8e9cb5a726dcea7969c
font_02_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 18072 bytes
SHA-256: 79f713250ec83d723b7b1f4978e511b03ea104208cd31e58830a0d67a4a69701

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