Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08efc489607e367…

MALICIOUS

PDF

89.2 KB Created: 2021-09-19 06:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19952c24c6fbf225f85ef4fd64ce9095 SHA-1: aac0026085b966f94ed1175e5a26c9d215f85471 SHA-256: d08efc489607e36774928442a4180345187efea947dc925e834728dc309e013a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to various domains, with a significant number of them being identified as a link farm on disposable hosting, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb6442408---wogedubifebanolunagozol.pdf In PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wurunimujarefuvekemor.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460bdc3c383---68354773010.pdfIn PDF document text
    • https://12shio3.com/contents/files/39998998189.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mizokij.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/supuxamin.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sodorilodamajexet.pdfIn PDF document text
    • https://biocoils.com/img/file/tipewago.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/luxawexabofibufaxiw.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/fivinudanepogazival.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90066327726.pdfIn PDF document text
    • http://cortabellanews.com/userimages/lubabaxibomi.pdfIn PDF document text
    • http://www.depomatrial.com/file/lejugebimegiwojowipu.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/vigasixujanetiwesonevigo.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/61321516272.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_123833.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/94810353007.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/76555970279.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/2123634513.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/60205037047.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/20567131099.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210911205606.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/dodarodajanowebixowirajoz.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/15563645902.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/10152663987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+dev+vs+ios+devPDF 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_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 9980 bytes
SHA-256: 78650d694f380a1235c06b001461c8d8812e5364fdf33e6c7a84ced7741c904e
font_02_sfnt_off000125ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AD 18748 bytes
SHA-256: e83d7e6566d9d70df7c4abbf2a66acb3db2129c1289eb159a62dbcd602a11360