Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9093320344fb32f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 00:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b9564961d181978e6df943097ce269c SHA-1: 581ec7535486457df5c635e113c9fbe4ed53baef SHA-256: d9093320344fb32f52f8ed77f79eeeef783fcd47eb363ecef9bcf6b4b04fcd9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, with one being a redirector for a search term, suggesting a lure to a malicious website. The PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+free+online+watch PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b0232800df1a375e6adbc3a9d507b7bb/7494320319.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091653365106.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/gijikuder.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/tidefugoziwepa.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/gakixupawumuvakopituw.pdfIn PDF document text
    • http://lj-group.cn/upload/files/68801069260.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210915162653660.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xunosazumanizazipazu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/87279904478.pdfIn PDF document text
    • https://lesura.net/userfiles/file/85059049742.pdfIn PDF document text
    • https://hn-as.dk/sites/default/files/userfiles/file/6228183276.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/73285196847.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/72440958853.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/74500d676723fdddf72b16fe37f408df/78406104635.pdfIn PDF document text
    • http://logicamail.it/draft/media/bizanej.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/silosisugot.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/jexuluvom.pdfIn PDF document text
    • https://migger.dk/userimages/file/lobutidegisisotu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/38907793808.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/63323757419.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/85147061286.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kujixujabesameros.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_off0000b0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 10944 bytes
SHA-256: 82d7b63e6351c068451c60f25761af46f5cee8bec8a735c2a2341ba8aab39356
font_02_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 16444 bytes
SHA-256: c142cc0bd98bc67b4c1e21835fe58b917cb1458ff4f92d7306146f92f64a3dd1

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