Malicious PDF — malware analysis report

Static analysis result for SHA-256 12965f6e31414b35…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 01:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db851b9108fbf05e70c2aebf1e98e46f SHA-1: c4507bd2a8519571230f051c4b3461996a5a45f5 SHA-256: 12965f6e31414b3520065c647a2266fd44c54739b15971a06cc1a20898377111
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely leading to malicious sites or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to a network of potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zugaxuraduwufaxebezusixoj.pdf In PDF document text
    • http://mail-business.ru/uploads/file/zogifelizasa.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/tipidaruwetowariroxu.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/26416052399.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/8938624812.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/11856274698.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/76814805754.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dabiton.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/60753092581.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210915/file/botajekidevepovixon.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/46840293403.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142464020454---molun.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/88914776323.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/39307478117.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/meliwuw.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jolivupasogomanokeweru.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/9448867740.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/26648388250.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/linaba.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/ruvokorezevo.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/68149706607.pdfIn PDF document text
    • http://retailcop.ca/files/xasibagojoboteninirawifek.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/707469549.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/wepanakuniriruvizajodaw.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/51964331682.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/wamakunurujepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rupaul%27s+drag+race+season+7+episode+1+streamPDF 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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 11136 bytes
SHA-256: 4914daf752f96cbc3349797cd2fb958d003a6d3c3072ff835905b668dcd4b6bb
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 18540 bytes
SHA-256: 0c38e69033c3578d6e85e8df8aa848ca7c4d58237ae1dd63ba35b36a55fe0082
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1