Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47e40dd707a94b4…

MALICIOUS

PDF

92.0 KB Created: 2021-09-19 19:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 100ec5de81824e13cbd63013fd704aa7 SHA-1: 672c7bb3592ed3746101f051b08d34bea6a07888 SHA-256: d47e40dd707a94b46fc9661bab24c576af2f5130dd6780fbe0b768f986075ddc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many pointing to disposable domains and some directly to IP addresses, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://laborke.ru/uplcv?utm_term=which+country+has+the+largest+landmass+in+the+world PDF link annotation
    • http://musicincw.com/fckeditor/userfiles/image/tojunofagevejega.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/21094181512.pdfIn PDF document text
    • http://elsped.hu/files/file/xiloramuzowavinetow.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/papev.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/51801049341.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/21471176068.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109100222273677.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/37247909787.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/19792907344.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/tataginewimosobevevavepit.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/79032474855.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/93669989246.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613247bb210f6---16786089492.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///34847014679.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jukajon.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/14/lupodifenasafuwakefo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/11069693754.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/siximegikula.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143f402cde83---dekovapi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/medizipu.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_235403.pdfPDF link annotation
    • https://childprotectionindia.com/lexcyberia/userfiles/files/rufowesivoro.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/liturudokuvokodojeguzep.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xukej.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/91280186112.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zirajIn PDF document text
    • 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_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 17596 bytes
SHA-256: 47d6b16f47ef55e88f35e64715ecbe1964c6aaf224bb7f02104101ffa68c6e1b
font_02_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 11112 bytes
SHA-256: 02d8d72e7b3871dc53e672419bcb7781bdcc5201aa4ddbd8931185c5ee53b677