Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f701919abdd0de…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 10:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e341752c58a943e6160a322550b72c8 SHA-1: 3fb6d28ad2508d271071d42e817d5924c849b1ba SHA-256: 15f701919abdd0de6575b0849088373ab87346197f94de6dd4032c477314bd7c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The high ML classifier score and numerous external links, many pointing to PDF files on various domains, suggest a coordinated effort to distribute malicious content. The sample's structure and the presence of embedded JavaScript indicate it's designed to execute code or redirect the user to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

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 http://knowleangling.co.uk/ckfinder/userfiles/files/rusejavozolazuwowa.pdf In PDF document text
    • https://nhahangbienhaitien.com/uploads/files/73019858845.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jijixogovobewikoji.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109050420472938.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/55227664694.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/82000269594.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138639863faf---xotelexiwagurukapobuvap.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/46892567812.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/20656585577.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/30001837249.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/74203429681.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/moruxoteronutarezekemet.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/99857490739.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a4c3a09d---berezijorabuxezijipu.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/44369129196.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/livugopufatekisolemeruw.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/27985919441.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/74970149146.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/21773030695.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/dabezux.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/leleterelelojenesamepor.pdfIn PDF document text
    • http://dd-eng.com/files/files/matetunepeza.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/28651841398.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/gazezegabikewufigib.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/lalivejawivuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=no+oem+unlock+in+developer+optionsPDF 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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 18420 bytes
SHA-256: 59f924d52c273c64f2dfd2d043c23d328f552981ed1ed56e909845da71a204b0
font_01_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 10748 bytes
SHA-256: c78e6758c14c372d96f55392ddba4942ef439f21bb31324550199fd4fd602fe4