Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89ed3b94890b5dc…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 04:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3c14c7d2e9e5430a7d1bbd0f2fe6715 SHA-1: b8c0f0cdbeac1b0965b062e87de8000d9e560e98 SHA-256: f89ed3b94890b5dcb569ddbbcf8cdd0190850fb28be6c4cc8e48505ece07226d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable or unknown domains, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ser-buk.com/userfiles/file/nilokolafexivadigiwamu.pdf In PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/rusegijasisirigepeluj.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/96161712499.pdfIn PDF document text
    • https://raljob.com/userfiles/file/fuzegebiwunowarileviwuju.pdfIn PDF document text
    • http://mq-water.net/upload/48082785693.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/49023473269.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16136140424542---tarowoxudoruji.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/getok.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76234726653.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/42448715357.pdfIn PDF document text
    • https://electroagro.es/pub/files/fosogor.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090601374573499.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/lenevixubemi.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/dowulaluzo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/647fcb6873560a9954a80105c06026e3/57428173813.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ruludunuz.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gagaziwoxakijusa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kotuxuvawizokenulaferu.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/pajobetuj.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/rejexibezeromuronedon.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210910_7D77B59BA7753C6D.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/kasoxef.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/63607995507.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/52038424831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+connect+mobile+internet+to+android+tvPDF 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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 10644 bytes
SHA-256: a1bcaeb53e41e7bde9c6d1195da3707935b9f095e421fff612ab0b4ede83b5ac
font_02_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 17160 bytes
SHA-256: 4732be14a4f44a7de0535fee4fcaff5f884916147bed965a374f0714a1b07d78