Malicious PDF — malware analysis report

Static analysis result for SHA-256 3260b9551854ebfd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 19:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c3c6f2fea0d5f58808cf7e0e82abb00 SHA-1: f319f32b02584a798fd4706ee250f75a1681e0e0 SHA-256: 3260b9551854ebfd58bbb9de7d300021c0f846e5bfcc56156ccc526b5d217c7b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ppsspp+games+for+android+free+download+100mb PDF link annotation
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/bobagufumivojasaridovuwu.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210907080843.pdfIn PDF document text
    • http://brenderup.ro/mm/file/28339644914.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/80937315551.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/wifodofikuzedibi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6bf82492d10fc5abfd3b9ce8327fcbda/67513293147.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/lulozobiwewukolib.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/99403929278.pdfIn PDF document text
    • http://afslab.asia/upload/files/60842231134.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/20488764194.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/webekab.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/68774994252.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137668771f9a---33446492671.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61351966416.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/21910982401.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/lapubinosafiwe.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/janakezumujarawudoxo.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tusawajofim.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mejewigilizapisibuse.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/27302746614.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/68914578319.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/68022246986.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/48618363061.pdfIn PDF document text
    • http://attlas.center/userfiles/file/14012849620.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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 11144 bytes
SHA-256: c310c12898a801c936fd2eb5efcf812ef19901ea70666333834734d19dc68091
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 17652 bytes
SHA-256: a38a1653155e4ca9a01167163994611f0d88ebf92b359f339a240882414720f4

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