Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0ff255aa02f3cd…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 11:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8932df53dfd0ee9440a412efd952db80 SHA-1: 5cb5e6053b35509a3f44b8da3409e00012fd1149 SHA-256: 1e0ff255aa02f3cd12d850eee69862c254fee425b60db15373939082e4cdf8c9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this pattern, suggesting the document is part of a link farm designed to manipulate search engine results or distribute malicious files. No scripts were extracted, but the sheer volume of links and the nature of the hosting suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://goez1.com/10005001208290177/ckfinder/userfiles/files/72859258548.pdf In PDF document text
    • http://joyandwowbook.com/upload/file/4014432685.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zubanewadilitagugez.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zujopapavowoked.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/45349579169.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/laroluwimudurolomuwiz.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gufezobolizova.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/sokixixiwibemoxe.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/57269317964.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/77487430267.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090803005832.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/65828797857.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/30943119512.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • http://net-marketing.hu/images/files/70700680081.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/39809835385.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/59974571465.pdfIn PDF document text
    • http://hijoin.hu/editor_up/rekalixiseridozepaj.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56696207877.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/98912775740.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/98883820872.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/dadariwasasujizofegikaz.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/saxini.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6188930314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+free+wear+os+watch+facesPDF 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_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 16432 bytes
SHA-256: 7a081fbb7a9e6946c4b13be6032f5a4409fe634bbce70c0022946217329d59d8
font_02_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10328 bytes
SHA-256: 62f6aaf17b21a5b30f96f1fd1ca16a51f85272fc0ce98a1b2284b37f94a15275