Malicious PDF — malware analysis report

Static analysis result for SHA-256 7974b899e2d78d5f…

MALICIOUS

PDF

103.5 KB Created: 2021-09-16 12:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffcd5e156a5101fa697ac4ee18c391b8 SHA-1: 45786f3764848104221ff1b10fa1ed5d55cfda9c SHA-256: 7974b899e2d78d5f5cc948ff8782a9ed8c39d0ff77f7d8f3a916aeb00a93681f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The document contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=digital+signal+processing+in+modern+communication+systems+pdf PDF link annotation
    • https://cebubigsellers.com/userfiles/file/daleromexuwiferurozapewox.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/34780632905.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ef746ff48b7b4b23b4f49bb8e8f3eba/suxon.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tudajugagudozamokiwijilo.pdfIn PDF document text
    • http://tchid.net/userfiles/file/nogixukuroja.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904111603506.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/1491694471.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zekexuwusosunakebukazakal.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/76545965724.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99978692434.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/giwusumilune.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/revamitaziveza.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/788805696.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/17541371755.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/6132943944.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xuxalikilip.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/77374579445.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910163230393920.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/melakunaxejijedis.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/14071483962.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/77029507200.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/89357803876.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210911020017.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_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 19644 bytes
SHA-256: 44ea71c23b4c3401ff8f7bc092b3af3d8fc351d3f41fb078ddd27e3eb57d582d
font_02_sfnt_off000175bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BB 11180 bytes
SHA-256: ef85825728697b9ce3a171a8044a563f5c250d2a6f8e64798170ea6dd3d9d360

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