Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a663fcfa779cf53…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35ebf3816a6511a657698171b60d0c2c SHA-1: b392c6040bf02f34c0099c19e33598d15015d512 SHA-256: 2a663fcfa779cf535d9795cf5233640ae8dc8cf49e4a5161cf2190ca4cc614f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters for tracking, suggests a link farm designed to redirect users to potentially malicious content, likely disguised as free software downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

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 http://photo-preiss.com/upload_files/files/sozulibetifadi.pdf In PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/14686485603.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/54730650609.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/20524268247.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/8269185452.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/58470803418.pdfIn PDF document text
    • https://thietbigas.net/media/files/besowil.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edb867051---nesubexademobuwure.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/68172525720.pdfIn PDF document text
    • https://qnzar.com/files/medovupubixiberusosuwige.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/kezijifexejoxofivip.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/razikixewu.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/41786930460.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/70992187809.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/revujenonadovifune.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nisisedolewibawekuxeladi.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/daxepazawisov.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/kemimezebudipu.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/zixerewejotemex.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/45282709747.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/59148801737.pdfIn PDF document text
    • http://tion.hu/upload/file/xejidazajevipogubifobezid.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/ruzunuludaditodileku.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/mukitedebuvukuwojopomona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rayman+jungle+run+free+downloadPDF 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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 17976 bytes
SHA-256: d1d4afe8b9ebda29ebab7da9b7114da35933e14761fba977e0a148bf7ce91657
font_01_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 10812 bytes
SHA-256: 3ca6c098aa5908d8ae6801321ab6e2ec1e18c1bb3917dcd5f52236630611aeb7
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1