Malicious PDF — malware analysis report

Static analysis result for SHA-256 1def560f26e2c912…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 02:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f325df6004dd9b7f09965fe85da96bb9 SHA-1: 2da963b984c2040da90be0dc55eb1557c0868266 SHA-256: 1def560f26e2c912706e775ed232f84ad8b97559fdae49ca3fd6bd41d70f0b1a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to exploit PDF vulnerabilities or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://firsatoyun.com/calisma2/files/uploads/15236151608.pdf In PDF document text
    • http://servicedental.it/userfiles/files/kerowepirokeriruka.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/fewavum.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/16266747146.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/27647264718.pdfIn PDF document text
    • http://ymmicro.com/files/files/39692334892.pdfIn PDF document text
    • http://ternovykh.ru/content/file/tufoduwakipi.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/64434856289.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wonagapejememojamagus.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jaxanejimapeso.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutipenutek.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/83979656246.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/kutewixu.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vuwababudagadulamameku.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/temunuwafapigixum.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/53348661499.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5b267d2f---29208223711.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sabinotutini.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/suzezoxuwizev.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/lovibet.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/masufanov.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/55443385307.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613963291ec65---18749469214.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/bujavinapujan.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/jigavijabumenativu.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/lofujenafuwevut.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/satubunopif.pdfIn PDF document text
    • http://ed-union05.ru/files/file/32837510495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=applicazione+sms+androidPDF link annotation
    • 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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 19336 bytes
SHA-256: 020aaa9fa5994acb47570f7531e20c78e7ab6fd8d8845738527f75e426da1c08
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 10620 bytes
SHA-256: 97017e4f181120f99b964b79480fd7803086611619eb7462050e6645708af962