Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b3e0871949cc4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 09:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1c7c4dd9683a5951ecd65c204967b2e SHA-1: eb069e099f26bb5b8255b2bb72c875c39e613424 SHA-256: ea4b3e0871949cc427f37852f591a7b875c2b07c99cedaaa87bd07609c05149f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to lure users to malicious sites.

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 http://ahjygjg.com/upload_fck/file/2021-9-19/20210919143527880675.pdf In PDF document text
    • http://sportingfoundation.com/uploads/file/95237123291.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/82581753053.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/sameladamizapanuneruj.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/xavezesuxolopivi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/99379256199.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613150fe76222---pifova.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/niwawofibafabemowoza.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxobasaw.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210909_54F0B6FDDF3AE9E0.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/29139389684.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/gafazivovelo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lanexanavibupodi.pdfIn PDF document text
    • http://freewest.at/fitutaxowepazovog.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/3572478262.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0suprkotqks4vo43ll2smfp74/38300517331.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/80589527781.pdfIn PDF document text
    • https://preciseenergygroup.com/media/37397818679.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/74833280327.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/80800941523.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/25596203380.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/24689959081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+ultra+sun+and+ultra+moon+apk+download+for+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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 10936 bytes
SHA-256: f2ddda5a553e2528bac250be07b214cd23f34f18ad1fded0e2dc70c6f05a4f85
font_01_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 18044 bytes
SHA-256: 1383b7e0ec294677646aac0bb5f34891db2d1655a49d63e9f269c27fbdb41d4f