Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b583d272524ec3c…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 06:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c04f5d435d9cc7448382003d5e664ade SHA-1: c9bcfa29189bff28be022d087320b105bd644684 SHA-256: 4b583d272524ec3ce3bbd423358a0b5f4387eee7af068f998d3ce7e19317a706
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the presence of numerous external links suggests the PDF's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://huntic.ru/uplcv?utm_term=mini+militia+hack+version+download+apk PDF link annotation
    • http://banglenhospital.com/UserFiles/File/92546160935.pdfIn PDF document text
    • http://vejwun.cz/images/gipenikowaf.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/35879839171.pdfIn PDF document text
    • http://regmac.net/userfiles/files/madib.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/46689705731.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nne2qd90ugqq81435hn8fctf29/desulojorofu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab9d72b9c---tiwusabizekesevalevujexon.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zogewirinug.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/14298594072.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/vakenagujelupobubupedet.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/wiropoxuxod.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fimilu.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/poriderileputetutode.pdfIn PDF document text
    • http://npas.ru/pic/file/1229060419.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/11043893799.pdfIn PDF document text
    • https://digiconelectronics.com/media/93039910148.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/gudotejasivusero.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/texazomikizewetaxo.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/liwafavotubulada.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/39591736643.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/78387341264.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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 11016 bytes
SHA-256: 3b38abaa7060e4eb212a6c74358efb6cb87f69a281d171ea8e24f9b53ddf2575
font_02_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 17016 bytes
SHA-256: 92d5ac7c1ec624f82e030ea72b7e25706717659b4e02cc36beb2d2f86d7a01c0