Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f8dd6e6421736…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 22:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79e1f58232fda9524d67c441be342cb1 SHA-1: b6dd322012793c535abbf200f089196e657eff04 SHA-256: bf6f8dd6e6421736510c77cb485a157a95670dafd92cb027e37a5e40e886b380
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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.
  • 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://baatco.com/ckfinder/userfiles/files/77762054452.pdf In PDF document text
    • http://abwfinlay.com/uploads/files/32559178922.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b24bbce5---76354376908.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/46753318791.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/27157342841.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304838605301.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/nukakexe.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/61631154157.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614755823163d---nudagibavixixelodin.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vafatuwudetabur.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/6861390240.pdfIn PDF document text
    • http://health-bridge.in/upload/file/25830628024.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mituzuwaki.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/37664285121.pdfIn PDF document text
    • http://ijfbn.com/editor_up/xukolakozinelagilovuv.pdfIn PDF document text
    • http://fruitvita.com/files/files/luxufadamadawojiregezu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62271030155.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/zikuxikunisijofuv.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/46695166859.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911202314.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/xalufuduvabe.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sodinonexesiwakudusijo.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/10749010312.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/62442657.pdfIn PDF document text
    • https://purefeeling8.com/data/file/72827607811.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dfc9facc---legolijevofipas.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/48396091592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+1+hill+climb+hackPDF 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_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10504 bytes
SHA-256: 1071b77812c3dc9dfc148bae89ae6b5136f7e2c5c532deedca3ef29076c284b2
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 17432 bytes
SHA-256: 8fa23891e5a4f4e28ca3fd7069722c0a25930fe5aaa298a4762fcd758ce307d2