Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb25cdfc7f159b1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2da9dd345c074d17885e768e8813226 SHA-1: 34348e685179aa7b588507b5859183053bd4ea56 SHA-256: 7bb25cdfc7f159b1f22dcfddc015c9f4437f8d42808854269b18e9e689bad2be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=free+live+streaming+boxing+tonight PDF link annotation
    • http://spellenindex.nl/images/uploads/15145380590.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/82882110111.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/92736056069.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///tugever.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/zozazunojizifikanuv.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/papiwamaveru.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/16774526955.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/namatafegi.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/12607219074.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/7633939749.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/91314241205.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da83aa04d---80608466009.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/48905237286.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lapop.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/wukomeger.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/seketenuwifatiloluxunoko.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/48516918425.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10574622426.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/85726347582.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/64569852131.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/gadawamuxajonopa.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/74453506878.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/totemadif.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c10ff1c22---mijijefa.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/tedevovepunalala.pdfIn PDF document text
    • 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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 17476 bytes
SHA-256: 23c7e41b9ca6ac8ccfb2de58e23235687f9bd96bbfbf779f0fda1e93e2901301
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 10840 bytes
SHA-256: 89e71e690fcd84350d7001cd7773bf1235bd5c68ea9d0b0b5ba78a2f9928d46e
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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