Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed23b19b8c7e902…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 03:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b613d947ca8811c4a08938b9f30b220d SHA-1: 68ca64feda7e9460b60ca1299adf06e348479b37 SHA-256: 0ed23b19b8c7e90258b348562ac2e3a8ba40e93feae06bc6542ced00664295d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://headrepublic.pl/images/files/35896385679.pdf In PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/308023348.pdfIn PDF document text
    • http://gibisch.info/files/files/73954397888.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1b1c3eff2a7727a3f970e3894728cdb6/81400336319.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/72958873075.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210912_5DC3BD5C233BA3A6.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/kigeferuludukag.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/dazidasuriridivinijev.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/moxorezaxaparoworafilije.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/zovife.pdfIn PDF document text
    • http://prograsifkalip.com/files/zalire.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rukerobijodozirujuj.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131907585429---81967415319.pdfIn PDF document text
    • http://hibertek.com/image/files/20210903_184724.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/jasozexulaguwobeli.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/kifalebupeg.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/45704734666.pdfIn PDF document text
    • http://chengzechem.com/upload/files/rotixozoxojivefazud.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/genugawujotujezisukevoke.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kiturakusatovividez.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xinoxopu.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109171723265134.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/votusujirojamiben.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/42428628998.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/fupavumoguboserel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+pe+download+android+multiplayerPDF 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_off0000ba76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA76 10904 bytes
SHA-256: 4132be92cd3f814e888642a3aaeee5d53b5e0526146583112cbbdd84040e4be0
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 17008 bytes
SHA-256: 4921b5ea2a7048c5b14de4e5f599b06f3980285225625b9f435724e47afbe7d4