Malicious PDF — malware analysis report

Static analysis result for SHA-256 a218764dacc9d7c5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 16:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8120059328aa9bd160ff46d3db76185c SHA-1: 803e7333a030e050d46856fe98a65b8a11ecba2f SHA-256: a218764dacc9d7c539cce130c04af4e0b743bce24e4ac3d4d68435ede5f7afc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute content or phish users through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+root+a+moto+g+stylus PDF link annotation
    • https://habibitours.com/ckfinder/userfiles/files/58089141895.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/dijikotadevilonulimu.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/pegaxuvasodole.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/34686683032.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/89618675140.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/37309754265.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/wotamopalonut.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091217143742707.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/8020428457.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lowotule.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/9394475146.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/99597305842.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tetazuvatoraxuginik.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tivokaxum.pdfIn PDF document text
    • http://net-work.cz/data/file/30548389625.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/mexakasanuxazibuxa.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/72187990863.pdfIn PDF document text
    • https://lorus.rs/files/sowen.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/49921556751.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d4b1deccd7028bd72596db441d354350/fodomumemixab.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vipojexudeliguvalaxeme.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090023364310.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dofux.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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 17768 bytes
SHA-256: 471611e331d660c3dc4d8991c006e233771739a24c9a83c1fa69eab51407c146
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10416 bytes
SHA-256: 527af216c9e5bb0e8b43e3582824b33cdf80022c851106d738505371c091eec0

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