Malicious PDF — malware analysis report

Static analysis result for SHA-256 d509a8545aec4d58…

MALICIOUS

PDF

86.1 KB Created: 2021-09-25 10:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ebec3d2f4fe6f12f6094c10a13e7177 SHA-1: 89ae781edfc3d48ede591814259afe02ae00fa2e SHA-256: d509a8545aec4d58a3706b53cf867c469d5e67b6829c09d807f34f0d16227e7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://natanashoes.com/kingkong/userfiles/files/88012632141.pdf In PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/lukofo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/17655264599.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/lobaxapabadevudega.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/23192814581.pdfIn PDF document text
    • http://klenderbio.com/upload/files/64610550770.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be181ecd8c---10542081303.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/legixavuzefoparudijokuse.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/26733443710.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/fizalenexojolew.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306519986kts.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/67956841149.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/89362966537.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/93589085030.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/zadonasutebegixopuda.pdfIn PDF document text
    • https://penzion-palice.cz/content/44400936861.pdfIn PDF document text
    • http://askort.pl/Upload/file/kotunupukapoxuv.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109071306347221.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109220714077588.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1d666649d---74143591197.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/35835953068.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/63617376845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+membuat+animasi+gif+di+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16816 bytes
SHA-256: f79be0da494f4c8cbd1f2a6d4d9a2c564cf0560d9d270361c4378c3ce3dac8fd
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10920 bytes
SHA-256: 3652b478ae86003b1044dd50df1489ce195d5677d200bbb6c8a3a6197dc86a45
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 16868 bytes
SHA-256: bd684dc62bb64645d1e5d4d018bdbf79ab79d337f427c7e2db6430cf1411b667
font_03_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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