Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b997e4be11709dd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 01:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b48bfd19430ca7e002266dcc12ae4938 SHA-1: b81582425b24bb40fd87d753c124b83174b5a75e SHA-256: 5b997e4be11709dd97a5a4e7c7d5efbfacd02565dabd3b0edca7013323a4a7b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which are part of a link farm designed to obscure the final destination, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is structured as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ingatlansos.hu/images/userfiles/file/simigexad.pdf In PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/botibikevo.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/ridibud.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/lumomijoxonofogibo.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/xilepusalezalifidosu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98563b8d1---52963299216.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/wusetupifikek.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tugizidiguliwuba.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/72039689228.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/29794741857.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/23878480185.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908170803.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/mokizopive.pdfIn PDF document text
    • https://12waktu.com/contents/files/pototes.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/75037850192.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/43014486330.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vimozovisewijujuk.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc7674dee---vobum.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/jarevuzo.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/46292150513.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/bijopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=star+walk+2+premium+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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 10492 bytes
SHA-256: e68674cb7c7f940f5b5ec042d6d0c53a86279595cf24e9126fdd6dad8f45fc49
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 17872 bytes
SHA-256: 0ac6ec251d7c7ce1650a20c22e9a8e3769b6c127c397cf9d4f2239345d2f69e7
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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