Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5d95bd529e04a5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 10:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 363d0a996ec99fe5630751fcb002810d SHA-1: 9aa0c278b1616b896d58dcdc61bbc9ecaa4f1804 SHA-256: eb5d95bd529e04a52d34b7e22398090737667e860a9c646f0f222838c30f5b3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDFs hosted on a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/6462796801.pdf In PDF document text
    • http://sattosushi.com/uploads/files/83006151503.pdfIn PDF document text
    • http://armanetti.com/images/bidajerojotivob.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/50028304502.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/21684586367.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/5887515928.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/18460781993.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/kubefovugajijazekesa.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/rafazonusawoduxova.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0cbda1fd36b3ffb0ebbed9ac86aca14f/liwazalitex.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1a0b936a3---dujegopujamonanevabu.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/89538534194.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/20997470750.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/noterazuwa.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/69401186653.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tajijegagufu.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/dufudezusobivune.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/sisurirulelarexitede.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/64133840136.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/kitimepumepadepetuxudu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/1103835734.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/61980065671.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tejalalejijisozeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=new+free+fire+download+apkPDF 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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 17212 bytes
SHA-256: 18abd244ef4e651af0c8fb157df03c979d9c9d9576dfa1d1382aae075c447b01
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10380 bytes
SHA-256: a9f647214103191f6e9f603eee0b984fa3cbf3522319428207aed9b51e95b964
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1