Malicious PDF — malware analysis report

Static analysis result for SHA-256 3344c99d683c81b4…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 852a22593d292a513396327948585467 SHA-1: d226c906688579a2627492becc50aa4c83f199ff SHA-256: 3344c99d683c81b4d720434872fe995ba3df075680e3ae03b9edc11b8a37b321
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites for phishing or further exploitation. The presence of JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=the+demigod+diaries+read+online PDF link annotation
    • http://toyotarent.hk/FileData/ckfinder/files/20210929_0AC473C1A37EB7F4.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/38371546648.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/zezosumizudebumed.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/43922246531.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fesetodopapozun.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/81798433555.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/70682275083.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///43031035474.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/lusabugaxegonezir.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/68401028623.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/bejuvajaxekuxibu.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/virasufebimajojulepitix.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/tibaxudopotexefidixopipuf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339912fc7021c4cebbeff551038452f1/3700028648.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/vagogobogu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/kepave.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/xirerebakusifukukavef.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf4a3dbbf---10714660998.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mawapaxixabolatulonukelo.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/88147105431.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/baxises.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/majaderotumude.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_off0000b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 10560 bytes
SHA-256: 43ce8642685cbbe0646e128b8a434a6be2f9d436717a9da3701370e8d23a7ea8
font_02_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 17256 bytes
SHA-256: 0025f99e34bb81880ccd9ee0339a35c2c1a8281101cb0f48b85d7570ff47b084

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