Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3566a197b9fe42a…

MALICIOUS

PDF

77.2 KB Created: 2021-10-17 22:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 866c05838bf36a0628ccf69fea2e2d91 SHA-1: 04e25dad91e106a05a9948e0ccc4642978f76a57 SHA-256: e3566a197b9fe42ad2192262925bfbf5f9bda0b72f4f5f14c3045a130d3e2d91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, strongly suggesting it's used for phishing or to redirect to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rockefellersgold.hu/editor_up/40014542332.pdf In PDF document text
    • http://litroshaber.net/resimler/files/dozulanevenuli.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pifaroxani.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/petawe.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/82575789430.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/90834444026.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/guwafaziwegetadular.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2ulkesn4dqd9b4h8ni4ku7hq6k/welerosufavurexivorexejet.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/23073713025.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/xakajavan.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/10631321018.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/47110677041.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/burikegiwitetari.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/pilumumujedewo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/g0p0pee461nshhu67gsm6gv2lg/lavukumubonolese.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091601345273499.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/2583303957.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/42992579135.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/131904497796.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/reximavoroxofuk.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/tadewi.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/luxukesiburuv.pdfIn PDF document text
    • https://ka-base.no/images_content/file/60498961763.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109180433288838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=remove+blank+page+at+end+of+word+documentPDF 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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 16584 bytes
SHA-256: 3e938915d5479250972c553419c2a7874b16fabe05623caf5ab3a9807d14578c
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 11232 bytes
SHA-256: 397133559671eef32c7ed823f80af9a06ba7c2c25a42292daae2fde9d4b7c820