Malicious PDF — malware analysis report

Static analysis result for SHA-256 00953be925a4a8c1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e2f8ac5e81a6e80bbc6edd584c6c4a8 SHA-1: ac525abcf7688899f5197a901f5a36af12cd014c SHA-256: 00953be925a4a8c11575ab59b4101059282d60a8986d01002d951e04b939d979
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yp05.com/_UploadFile/Images/file/nesavolikaxisom.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/tanowolefegadeso.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910181141.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/pezejapuserirozuni.pdfIn PDF document text
    • https://suncables.co/images/file/71916314914.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/79700672727.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/46721322959.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/28428687406.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xudivunufotigufawot.pdfIn PDF document text
    • http://gibisch.org/files/files/kuvagex.pdfIn PDF document text
    • https://cncunse.com/d/files/popoborux.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zixilekaxefubakozexolikel.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/luwoxudemezadatuzi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/36825566329.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/38271358573.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/19216131002.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/sikamusazufesibu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/bovowimikanodanatofe.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///13556606526.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/8541526492.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/55096814161.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/80919595330.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/99620831157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+android+walking+tracker+appPDF 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_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10920 bytes
SHA-256: 8eb050c30f92cb5b614f7ab00904605cc457550613c9fa053c98ec16f4a82e96
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 17168 bytes
SHA-256: 89db3689b41280f7bd95546af33b346a8caf5b721389a4ada452996d1091158b

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