Malicious PDF — malware analysis report

Static analysis result for SHA-256 44eed13644df3174…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 21:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4d510673685d5886de9b5858273c88f SHA-1: 56d4fe7da001ce2464c2e4a1b6d6f82ffd17dc2e SHA-256: 44eed13644df3174bd34f5ca3547dd1a73d4cdbc7a41e3f09ed6dc6f23411304
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm designed to redirect users. One URL, http://smcertificationservices.com/userfiles/files/bujalilugivejomema.pdf, is directly flagged as a potential entry point. The ML classifier strongly indicates maliciousness, suggesting the document's primary purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smcertificationservices.com/userfiles/files/bujalilugivejomema.pdf In PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/gidelesibifabin.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/53961763859.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913160914167.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/1048823604.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/rolufofojovig.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/noxigonuwafuga.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/punuwe.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/42588699287.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/46444764153.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gagugapezufelojin.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/dabizigalenobowi.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/ruzubonigujurupepe.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/13548256526.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/31256795753.pdfIn PDF document text
    • http://yjccnc.com/upload/files/96450769255.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/bolukudabemowezemozoxibun.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7b748bfb21c81fc4d5993c671283e589/xuzatawanipalejaruxawiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+java+for+iosPDF 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_off0000be5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 18316 bytes
SHA-256: c9cd662be57e06f641ee7900e5d1012670e0bfea01c934700a355c02b5a8a114
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10472 bytes
SHA-256: 7c0772d946e40e85243dc9c439c155aaf819a34daf03328bfc3fcdff6a325271

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