Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d309de7e05200a3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dc731c5d3ce6181c41a7713497f5e9f SHA-1: feb99cd426752fbd1d794801ae1f566e519b522f SHA-256: 5d309de7e05200a3e08b1e2f56129de776dd257ceb2f69816bb467c1be3adf25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and a phishing/malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://machnhaduong.com/images/uploads/files/tibelupafukokisovoxokepup.pdf In PDF document text
    • http://phunggia.biz/userfiles/file/63664225008.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/mubobafubugononinomo.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/80046706044.pdfIn PDF document text
    • https://istanajp.com/contents/files/57186584344.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/58263176715.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/wugivoforoverog.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109112047124742.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/63816170762.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/37937167292.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0cd4d99a---xelosotuwogogukonuv.pdfIn PDF document text
    • https://ratosatu.com/contents/files/91555747350.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3733591cafa692d40e488da34ed43f60/budajuvoxasefalodadan.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/5195313652.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fifimagaga.pdfIn PDF document text
    • http://gotween.com/userfiles/file///22538877868.pdfIn PDF document text
    • https://orangerun.re/photo/files/91895567034.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gevul.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/190506467596.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/tebisudavemow.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sonidixawegedusufugamedu.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/20351969346.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/zakujob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=najlepsza+przegladarka+na+androidPDF 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 18620 bytes
SHA-256: 7b64798b207ba6afc7e628538d2c9fa60e64d1f087e2f63b8169da91aacf17fd
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 10728 bytes
SHA-256: 2cbf7e87324634fffe40b6e3752cf7b8169b1da11c98ccd827711243181e3bb2