Malicious PDF — malware analysis report

Static analysis result for SHA-256 4617a64403e635a0…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 02:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c0eea0ca1c326809cad7eee281fbebc SHA-1: 02f2c0e77c9527c1623a23516a741a3a903ff600 SHA-256: 4617a64403e635a02bdfbfb01bc163fc076c322b3514825aec8eec8b4b6529fb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to other PDF files hosted on various domains. One URL specifically mentions 'chapter 7 great gatsby pdf', suggesting a lure to trick users into downloading potentially malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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 http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8226fa9e---jixuzaroxirubo.pdf In PDF document text
    • http://pradakshinam.com/fck_uploads/file/nefibabivutej.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/51892491372.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/14051319326.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/77802182815.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/kukobezolozifawonom.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/25928683261.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/xojitinuwodevibimonod.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/46714681383.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/61087161200.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/derumumuto.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/potukusajarofanid.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///48404389755.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/94949874572.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/vofewiwufifumipit.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2f891ba---43798544421.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29882388507.pdfIn PDF document text
    • https://pellevah.com/upload/files/75842949473.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/dasiraxavabiregez.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/69453859974.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/mebowetope.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901083048.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/4204937535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chapter+7+great+gatsby+pdfPDF 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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 10752 bytes
SHA-256: ca48ca7f610bcc879fba791187ff586b85ef8497d34a5f2cafa660376efe7915
font_01_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 17008 bytes
SHA-256: d05e326f62e4ac0090d614378d4936e48dad5b27307ed4e7041f0025e104ad82
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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