Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6ffef9b518f04d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00eb01c125f0cf752e2c6d6e4fd202d9 SHA-1: 264b4d573b832d937e012cccb182e44738a978ea SHA-256: cd6ffef9b518f04d5a7757ff3cc4a087a0e54ae73c9be8155d3ce2e17849a754
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=json+api+android+studio PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1665a9fe3635fc862542907612fa5c98/8619965395.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/67281512567.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/82767354008.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/55578681789.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nupokifabavomigusegirir.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/64840006792.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/pelexo.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/18180454006.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/lilidom.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/guketodujofi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/lijuxawuzalatobuko.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210920_E4EA1FA730695E4E.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/58570961828.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/15523710329.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3abbc0c86665de5db1918e16298c1978/feruxedo.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/53453195760.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/29312318231.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51600415066.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zewun.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/41560521489.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/57454772284.pdfIn PDF document text
    • https://penzion-palice.cz/content/28709963491.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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 10296 bytes
SHA-256: b00bd14668cb19f1127dbc81696e2152d727e93e0a66662611fcf0c93315ee3d
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 18504 bytes
SHA-256: 4ba3272edc5a9152a9b757342c72798c88d11aeaa372a06fe389c0e48a286657

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