Malicious PDF — malware analysis report

Static analysis result for SHA-256 56555c673af8203b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7cb47a9ddf22bf0641cdfeff86005f0 SHA-1: f403ffad495b5e4d30d31237e265375ea2e4bcab SHA-256: 56555c673af8203b511b9534fd44756cfa734d42c30b6faa76bb56199047f189
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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 https://queure.ru/uplcv?utm_term=kinemaster+pc+software+download+free PDF link annotation
    • https://lideregitimpaketleri.com/calisma2/files/uploads/zegulokarazex.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/30319369047.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/20537812732.pdfIn PDF document text
    • http://zubrcup.by/files/files/xajajazon.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/lawexozagajasuzozazowugov.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/66072045900.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/bupisowet.pdfIn PDF document text
    • https://termoformat.md/img/files/74842264453.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/82580848662.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/62924878466.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/53461394923.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zasiwiwojud.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/83978447295.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/xopivumovulariteken.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/kixadabaradobulivefidebo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/22817981117.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395f61df4a3---venexulijiwijipiga.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///86919490079.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/76403376696.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/68767104436.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/kenoletugoraginibux.pdfIn 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10860 bytes
SHA-256: 054189fbc99b747be4e70b282c1482ce4e98f77d6d4966445250177fa9f23a02
font_02_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 17452 bytes
SHA-256: da85a728800b6beb94b5c5acfb621e873d1da300c821a456635c259a6b235b60

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