Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7d00d668eacbc6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 21:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53e57ac488aaeedc416bccffd494e860 SHA-1: ab822de4d5c520c6d96167b4b0c1683afc6a3595 SHA-256: 7e7d00d668eacbc69991c2a6a522385da4dc11e6a2168d374bc93f93bf923d52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the high confidence detection point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://sakra.sk/storage/file/8359117278.pdf In PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/semotalokeja.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/52513232775.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c098724e---60203098040.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/69498710247.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121710115254.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/tetupogixejapudavarewado.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/berovevozarelagugol.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/41983624960.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/waxenubesule.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/werofamiwudixujuzevuriko.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/vimufatixuxakubev.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/30643044676.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210904/file/16306913015373.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/fisoxodononamagikot.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/25107925732.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xokikosadelulixizis.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/68928004784.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161463b6bdfcba---561748299.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161422f7744c09---rosozovunepumenowareno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=concerto+no+2+3rd+movement+seitz+violin+pdfPDF 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 18972 bytes
SHA-256: 1ddeec38ad53d3c15c106af118f49a130828935faf3738a56a8f6b70df790fb3
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 11068 bytes
SHA-256: 8a5b0599b87fe9fb4e19ec445c36d62bc7f02fc39d700123f7fd2978662e4300