Malicious PDF — malware analysis report

Static analysis result for SHA-256 509d006d3054ce48…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 12:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7c6626ca7a028b1f42b2a05c6425e08 SHA-1: d790046193c50640f13c76052b4bf9fc3506a45a SHA-256: 509d006d3054ce4893a9cf357a2d48d868776916b7edd20581464a60338ae463
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to obscure the true destination or distribute content across many low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dges.in/userfiles/file/fajalewuvomajer.pdf In PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/30098047678.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/satubunopif.pdfIn PDF document text
    • http://honda-vo.com/upload/file/juwovixim.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/2192325821.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wetutur.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/54b5eebf9e46bca08f26f21ff3f9937c/sagukixunenaberevalimog.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jijuxusegurudop.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/konabilujo.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/razapoletor.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da87e8a36d---nodujoza.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/53311817361.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/77478544970.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/30836573515.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/pesamajidu.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/devusebix.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jejixujuv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/8127041573.pdfIn PDF document text
    • http://micruts.org/userfiles/file/kanegafigekeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+pour+windows+8PDF 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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 17308 bytes
SHA-256: fba996b182ec593cffda37ab5e5afb0d4dd22e7b480bd0dd4423dd26f41055ed
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10320 bytes
SHA-256: 5bb24062768ca9a32ee94891bac07da76f5b0a2bc0530cb7d36ae16f31116a7b

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