Malicious PDF — malware analysis report

Static analysis result for SHA-256 9912c353394ffa19…

MALICIOUS

PDF

86.7 KB Created: 2021-09-10 22:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7e9dcbd73845f735f3e0a2135938563 SHA-1: 7384ff4bbf08dc13961e6715a07f15bce4d60a9b SHA-256: 9912c353394ffa19baf7efdbbad817abe016c2c71d4afbea407a9dfb44aaa68b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=twilight+illustrated+guide+read+online+free PDF link annotation
    • http://cassotech.nl/site/data/ws/files/seguf.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/vuloduripi.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/81233455781.pdfIn PDF document text
    • http://carbontuning.ru/file/vixolenovetipowome.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375b5d97339---tulosekajimowugetaluk.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/33215564919.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_214342.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/pujuzudifamovem.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fasixorelam.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sorude.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labexilarilijotibawekimu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/29790987368.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/jijiponivajenefuzadagivo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/89553503527.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/wejizuresod.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/61222896521.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///semabuzovidev.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090712103_894742907.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/vixifafimofozobulaxip.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/68909830135.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/mezomu.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/dapixamigomepezugilod.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/36160864019.pdfIn PDF document text
    • https://lecachet.fr/docs/files/14993551582.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 17208 bytes
SHA-256: 04c9299cbe6601d0f12d9ed2f05887fefa45eda1e6fcc3e7e608959dc6658e68
font_01_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10784 bytes
SHA-256: 968fe9e4cfe31563b5e91cda7aff137aa8374014921f1c49e699fd0fe3498b45

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