Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec879e7d37cc121…

MALICIOUS

PDF

91.2 KB Created: 2021-09-18 05:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f137f0afb737693706a9cbdb7b755063 SHA-1: 1601c015d8263e984ce7ac256b8ea5a5bccd7087 SHA-256: 8ec879e7d37cc12187182512af4f0da460b54cf494df2691372802cc2243bd54
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=earn+to+die+part+3 PDF link annotation
    • http://bjqyms.com/filespath/files/20210902020634.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/93a489222059a1faf7a68a480cffd00a/donebabujemozuzawatuzin.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/gefurejilavom.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109130302408179.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/35969519711.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/75160137759.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivujov.pdfIn PDF document text
    • http://only-svet.ru/upload/files/riwuwuva.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/2920d3.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bafaluvedosuvipone.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144360346709---65540869650.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/soxodewojividujavezel.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/sagetubomumikolak.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/20292364955.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/72677007139.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/fazixajusuwibobakatogire.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/rumabalaxagefakuwelajumun.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/70870144083.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/40990636758.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/kexisimolexofu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xamom.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/wenerujaxujineritilisum.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/75865350906.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/4387058351.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/xugepodomirag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10324 bytes
SHA-256: 263b15fbb73f635ec9da92cf73611d0d075e0f23bab12475fd8bd33c161b488f
font_02_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 22828 bytes
SHA-256: 6d15a9099a5baaede1c223c2ec3dee20bb49139bfbff7e70375be100fbcd3494

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