Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3686590d31e903c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 10:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7950a64d41c4379056d3dac2432ecd7 SHA-1: 3fe0eba6efa105e0b25d2341a5ca1159cd204801 SHA-256: f3686590d31e903c804730cd8c652f6485310e0252972f9d720effa9d122c87f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=ultimate+robot+fighting+all+robots PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210914052010.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/62179656519.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/pefak.pdfIn PDF document text
    • http://cudicio.it/images/file/43863461017.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/silopegexiv.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50342255554.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/jasofofajetixurulujizuxad.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/mepufopomuritolisasov.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613670d8c8701---772811904.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/92487804233.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/81171052553.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/86586548998.pdfIn PDF document text
    • https://chptravel.ir/data/file/96701932017.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bijedawejupabigapakok.pdfIn PDF document text
    • http://redactron.com/userfiles/file/dusopezupalikez.pdfIn PDF document text
    • http://eichler-kammerer.de/kalufasijosajojufapago.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/54898883578.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xoxabozinanamoropix.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/pumisekexixu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/55aab058ab962167a2452d56fe7d09c1/29775006591.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/xajinafekumarobokiravu.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/56441081326.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/jewimuxiravabejejok.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/87750458485.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904193101.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/tupogojedesowujuwozam.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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 10808 bytes
SHA-256: 53f6b9398bc37479b8a3153ddfe7ae2aa8c89fb489feb01c0c34350c3b3a3c9e
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 18428 bytes
SHA-256: d1f70fe3bc2c3bba89e95a18ff4399b1d9614da58c5365834faddb4cf409ea2a
font_02_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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