Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3ceafdb9dfd451…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9f07c86b120cfab2e83a3b725c854e79 SHA-1: a92fa4ff68aed7a589fd824a684b240ef215fd21 SHA-256: 5c3ceafdb9dfd45153794dbdcd3abe545ffeb22f760584937b1baae7b2614e5f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers as malicious, indicating it's designed to execute code. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing a secondary payload. The numerous extracted URLs, many pointing to PDF files, reinforce the idea that this document acts as a lure or part of a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://losungversorger.com/product/file/lixetur.pdf In PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/lemekifepadut.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/totebupeg.pdfIn PDF document text
    • https://netlandschool.cl/files/dubivovopegagukawinojo.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_4289_930.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/9176919151.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/13193467434.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c08094ff0---4616358185.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/dowesiso.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5bd334e70---15370136439.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/45206004141.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/89780933513.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fomowanebikotogati.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/38618900512.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/datujoxajuxonom.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/vafowevuxe.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/55859163485.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/sekalulebejuxijezusov.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/65612925325.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mupetabapepuvopevofalir.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/pugolejelizeva.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/bawedofoxegujopipuz.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/90031537870.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/38668619102.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/fujozevuzasirafokefiduk.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210920205421384299.pdfIn PDF document text
    • http://parateam.cz/file/nivevujetokomimobuves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=parent+function+of+sinePDF 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_off0000b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 10384 bytes
SHA-256: 70bed52fd220b9328268ace59291a6f416c579ec801cfa04e2254a8b5b60c962
font_02_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 15700 bytes
SHA-256: 5cc04bf09308b724bdfad4d2ad46d1be52ac5cf65fa330fe02e30d51402c168a

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