Malicious PDF — malware analysis report

Static analysis result for SHA-256 4222b45175a211a8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 04:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ffc3608bf927b6cd14b39512e39d8776 SHA-1: c3e83400182027edc6a5c1bb83b2148e210b9f76 SHA-256: 4222b45175a211a852aeba2d8d5d7005d0691b55e7d94871a297e11eee7934d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic findings indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The numerous external URLs suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/45771827104.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/33145125154.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/wofarojefiwowadibedof.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/mulof.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/3209091107.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/xebupopuf.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tawanajoluxusodanabi.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/43799652590.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livoxali.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/96649687853.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/96718381590.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/zusebuvula.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/dukavoxokubo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tikejezeji.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912011503.pdfIn PDF document text
    • http://sunway.me/uploads/file/10115259349.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/jakafuxidixiguxi.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/774269370.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/24696025590.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/duzefa.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/lalifoxaxobosij.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/lalagumanixe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8312be17af2bd0d93f47cda3360d0d73/59916134054.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/gabetutajufekaxedav.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/digofuzu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/15175299882.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gufogovaxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=modern+combat+4+java+apkPDF 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_off0000b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 10868 bytes
SHA-256: bc297d5bed5b84ec76993700274a60c87f683dab76e527a891338b1834efd625
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16256 bytes
SHA-256: ff12db02eebf91e13b56dead43e4d9c7dbd1ea12a2f9d7e380f001567b050d0a