Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aeac50bfb879272…

MALICIOUS

PDF

93.5 KB Created: 2021-09-21 09:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 515d94b714b495f53902144c16e5182a SHA-1: 6b653ca450b8abb79eccf3f9b21d623e7a1f6927 SHA-256: 9aeac50bfb8792728639bb6d457ff1268d601b2459c0f4ac4a6817f0c9b21dd1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, and the PDF contains a large number of embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are part of a scheme to manipulate search results or redirect users to potentially harmful sites. While no scripts were directly extracted, the presence of numerous external links points to a phishing or content-luring attack pattern.

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://ketchas.ru/uplcv?utm_term=sony+android+tv+kodi+4k PDF link annotation
    • https://tiemhoahaibara.com/data/dulieu/files/xokepadifudinagokemes.pdfIn PDF document text
    • http://metall-press.ru/files/6105707622.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109110201414406.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wetabobefo.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/53060772550.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/58237444721.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///62408938159.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/jipub.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fuvosuvurirebojinikax.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/povip.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/midulogovowik.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/58632761845.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lefog.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb4db201---vixeka.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/98916829526.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/46671097907.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vomebuvenusulopo.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/73223076216.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/nudixutumugaguzibawasazaz.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dazizoj.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/pivumorosejerekopi.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109112323201786.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_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10320 bytes
SHA-256: f660872aa5fecd962432b13bc2d7037f8b66d15b202c19e4078fe5cf088a38ad
font_01_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 19888 bytes
SHA-256: ec166f0bc9d316c1a7c9fb571460505de734a5e5b9f87162a3ed051e8e69db6b

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