Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8fd333eeff94e4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 14:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 155892c23b43e1936738a344668bd12e SHA-1: eeb8141bd92fa4f73d72f4e5f96d7d2e24f26bb6 SHA-256: bc8fd333eeff94e45238a60781c303c3078332fc5f181fd88cef435cec908481
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious or unknown domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://shopgraeagle.com/ckeditor/uploads/files/jabodi.pdf In PDF document text
    • http://autofactory-jin.com/js/upload/files/diterosam.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/o73qdtp55d8s62u8pa19e100c5/muvasi.pdfIn PDF document text
    • http://12shio5.com/contents/files/36660768243.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xagifurefifadewulako.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/fijilikuwilanumazogopij.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/3840844854.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/71205466266.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/vodutibafonakodixonemu.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/76994648956.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/17871067158.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/89570026889.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/50166088704.pdfIn PDF document text
    • https://resicolor.com/upload/files/depevid.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/42277202729.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sesasojubutenukiwobo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/33558831032.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/fijikoviwovelijudimumuwo.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/xesege.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021923622217162.pdfIn PDF document text
    • https://manenshop.com/upload/files/16657276198.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/wefidazodad.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/mupukeremana.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e3713a72---rulafese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+apk+installer+for+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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 16704 bytes
SHA-256: 59370890ed9d0ded8ebece45589e6efa73819e41ea3a0a3c24d9b57cf71b7a1a
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10636 bytes
SHA-256: 91e1728dc1d6de863619c170dadf510de629fbb607093432c4f18ca5a189bbd0