Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8043814aec43e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 13:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2d558514a2b4dfa4c6e7fa8d8eae64e SHA-1: 220cf8aba444c3308b62875a4fd303d45fac0ae7 SHA-256: 13d8043814aec43e4c9ead97836090eaa02297f9527aa7ae55b328d59fab12bf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially harmful sites. While no scripts were explicitly extracted, the PDF's nature as a link farm implies it's used for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=low+graphics+android+emulator PDF link annotation
    • https://papiratisk.cz/soubory/vinixiz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/63004863006.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/890882141.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/40497070622.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/numoko.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/siseji.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wopadirokifagarimipajuzu.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/rasimokigob.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/megifogavovat.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/60953813762.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/44879325708.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/mijitekozoz.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/sifevij.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/loduvexonononos.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/voxozeduzopuwafur.pdfIn PDF document text
    • http://ewtch.com/upload/files/26996374190.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/89930235567.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/24439112046.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/21918061555.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a9dce5f---rejebob.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/94998287392.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/52205693700.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/19603822049.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17224 bytes
SHA-256: 6cfc475b7f070b2efaca605da64498ec0629d637de86c891cabcc219009f8217
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 11104 bytes
SHA-256: 8d70978e51905ba2aa9fe84696b342464fa9a42f7fa391c6105430c49b82f0e6

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