Malicious PDF — malware analysis report

Static analysis result for SHA-256 630876fa148fa8fc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 09:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcf515503f4b7f293ed0e40d5d17fa4d SHA-1: 1863bcf7de220374ee13144894e27e47884720bc SHA-256: 630876fa148fa8fc9a248c630e185324ed56705e1ff452872f3e30c53d3e10be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to external sites that host other PDF files, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent, likely to distribute phishing content or lead users to malicious sites. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malicious content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kuppersbusch.hu/userfiles/files/87594627316.pdf In PDF document text
    • https://gastriklandsbf.se/UserFiles/files/57024592539.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fapobekinasubawumafa.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/pasatonaxaropo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/89595442556.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/35031767306.pdfIn PDF document text
    • https://panoramabyty.cz/content/73028710236.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/didoxupo.pdfIn PDF document text
    • https://remini.hu/userfiles/file/vifepas.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133838dced18---zudakowosisudebajoruwowan.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/17889953921.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/nibewo.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4242897312.pdfIn PDF document text
    • http://empresa-venta.hr/files/85607646848.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/getasa.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/lizadifivosur.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/wanotirizul.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910195832144497.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/90612622251.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/37504061180.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/35119418303.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d33bb244a7fb53a81fab463850888d16/45980335713.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/solezidoruwusokuwu.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/10329564880.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/bobewipopujunozipatisatux.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/lowojuroriwasunorisib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=big+cash+live+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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10444 bytes
SHA-256: a5c4d298e26ffd74aa904ea1be83ae2d6a24d68bb28cd7508dd0c84a69684814
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 18164 bytes
SHA-256: 28d9c9207108ae8bf9622391fb81dfa033be5586f01cd62116a2228ffc06c527